replaced keyword "yii" with "yii2" in composer.json files (fixes #2557)

apps/advanced/composer.json

 {
 	"name": "yiisoft/yii2-app-advanced",
 	"description": "Yii 2 Advanced Application Template",
-	"keywords": ["yii", "framework", "advanced", "application template"],
+	"keywords": ["yii2", "framework", "advanced", "application template"],
 	"homepage": "http://www.yiiframework.com/",
 	"type": "project",
 	"license": "BSD-3-Clause",

apps/basic/composer.json

 {
 	"name": "yiisoft/yii2-app-basic",
 	"description": "Yii 2 Basic Application Template",
-	"keywords": ["yii", "framework", "basic", "application template"],
+	"keywords": ["yii2", "framework", "basic", "application template"],
 	"homepage": "http://www.yiiframework.com/",
 	"type": "project",
 	"license": "BSD-3-Clause",

apps/benchmark/composer.json

 {
 	"name": "yiisoft/yii2-app-benchmark",
 	"description": "Yii 2 Benchmark Application",
-	"keywords": ["yii", "framework", "benchmark", "application"],
+	"keywords": ["yii2", "framework", "benchmark", "application"],
 	"homepage": "http://www.yiiframework.com/",
 	"type": "project",
 	"license": "BSD-3-Clause",

composer.json

 {
 	"name": "yiisoft/yii2-dev",
 	"description": "Yii PHP Framework Version 2 - Development Package",
-	"keywords": ["yii", "framework"],
+	"keywords": ["yii2", "framework"],
 	"homepage": "http://www.yiiframework.com/",
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",

extensions/apidoc/composer.json

 {
 	"name": "yiisoft/yii2-apidoc",
 	"description": "API Documentation generator for the Yii framework 2.0",
-	"keywords": ["yii", "phpdoc", "apidoc", "api", "documentation"],
+	"keywords": ["yii2", "phpdoc", "apidoc", "api", "documentation"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/authclient/composer.json

 {
 	"name": "yiisoft/yii2-authclient",
 	"description": "External authentication via OAuth and OpenID for the Yii framework",
-	"keywords": ["yii", "OAuth", "OpenID", "auth"],
+	"keywords": ["yii2", "OAuth", "OpenID", "auth"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/bootstrap/composer.json

 {
 	"name": "yiisoft/yii2-bootstrap",
 	"description": "The Twitter Bootstrap extension for the Yii framework",
-	"keywords": ["yii", "bootstrap"],
+	"keywords": ["yii2", "bootstrap"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/codeception/composer.json

 {
 	"name": "yiisoft/yii2-codeception",
 	"description": "The Codeception integration for the Yii framework",
-	"keywords": ["yii", "codeception"],
+	"keywords": ["yii2", "codeception"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/composer/composer.json

 {
 	"name": "yiisoft/yii2-composer",
 	"description": "The composer plugin for Yii extension installer",
-	"keywords": ["yii", "composer", "extension installer"],
+	"keywords": ["yii2", "composer", "extension installer"],
 	"type": "composer-plugin",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/debug/composer.json

 {
 	"name": "yiisoft/yii2-debug",
 	"description": "The debugger extension for the Yii framework",
-	"keywords": ["yii", "debug", "debugger"],
+	"keywords": ["yii2", "debug", "debugger"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/elasticsearch/composer.json

 {
 	"name": "yiisoft/yii2-elasticsearch",
 	"description": "Elasticsearch integration and ActiveRecord for the Yii framework",
-	"keywords": ["yii", "elasticsearch", "active-record", "search", "fulltext"],
+	"keywords": ["yii2", "elasticsearch", "active-record", "search", "fulltext"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/faker/composer.json

 {
 	"name": "yiisoft/yii2-faker",
 	"description": "Fixture generator. The Faker integration for the Yii framework.",
-	"keywords": ["yii", "faker", "fixture"],
+	"keywords": ["yii2", "faker", "fixture"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/gii/composer.json

 {
 	"name": "yiisoft/yii2-gii",
 	"description": "The Gii extension for the Yii framework",
-	"keywords": ["yii", "gii", "code generator"],
+	"keywords": ["yii2", "gii", "code generator"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/imagine/composer.json

 {
     "name": "yiisoft/yii2-imagine",
     "description": "The Imagine integration for the Yii framework",
-    "keywords": ["yii", "imagine", "image", "helper"],
+    "keywords": ["yii2", "imagine", "image", "helper"],
     "type": "yii2-extension",
     "license": "BSD-3-Clause",
     "support": {

extensions/jui/composer.json

 {
 	"name": "yiisoft/yii2-jui",
 	"description": "The Jquery UI extension for the Yii framework",
-	"keywords": ["yii", "Jquery UI", "renderer"],
+	"keywords": ["yii2", "Jquery UI", "renderer"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/mongodb/composer.json

 {
 	"name": "yiisoft/yii2-mongodb",
 	"description": "MongoDb extension for the Yii framework",
-	"keywords": ["yii", "mongo", "mongodb", "active-record"],
+	"keywords": ["yii2", "mongo", "mongodb", "active-record"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/redis/composer.json

 {
 	"name": "yiisoft/yii2-redis",
 	"description": "Redis Cache, Session and ActiveRecord for the Yii framework",
-	"keywords": ["yii", "redis", "active-record", "cache", "session"],
+	"keywords": ["yii2", "redis", "active-record", "cache", "session"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/smarty/composer.json

 {
 	"name": "yiisoft/yii2-smarty",
 	"description": "The Smarty integration for the Yii framework",
-	"keywords": ["yii", "smarty", "renderer"],
+	"keywords": ["yii2", "smarty", "renderer"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/sphinx/composer.json

 {
 	"name": "yiisoft/yii2-sphinx",
 	"description": "Sphinx full text search engine extension for the Yii framework",
-	"keywords": ["yii", "sphinx", "active-record", "search", "fulltext"],
+	"keywords": ["yii2", "sphinx", "active-record", "search", "fulltext"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/swiftmailer/composer.json

 {
 	"name": "yiisoft/yii2-swiftmailer",
 	"description": "The SwiftMailer integration for the Yii framework",
-	"keywords": ["yii", "swift", "swiftmailer", "mail", "email", "mailer"],
+	"keywords": ["yii2", "swift", "swiftmailer", "mail", "email", "mailer"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

extensions/twig/composer.json

 {
 	"name": "yiisoft/yii2-twig",
 	"description": "The Twig integration for the Yii framework",
-	"keywords": ["yii", "twig", "renderer"],
+	"keywords": ["yii2", "twig", "renderer"],
 	"type": "yii2-extension",
 	"license": "BSD-3-Clause",
 	"support": {

framework/composer.json

 {
 	"name": "yiisoft/yii2",
 	"description": "Yii PHP Framework Version 2",
-	"keywords": ["yii", "framework"],
+	"keywords": ["yii2", "framework"],
 	"homepage": "http://www.yiiframework.com/",
 	"type": "library",
 	"license": "BSD-3-Clause",