added composer.json for yii2-dev package

composer.json

+{
+	"name": "yiisoft/yii2-dev",
+	"description": "Yii2 Web Programming Framework - Development Package",
+	"keywords": ["yii", "framework"],
+	"homepage": "http://www.yiiframework.com/",
+	"type": "library",
+	"license": "BSD-3-Clause",
+	"authors": [
+		{
+			"name": "Qiang Xue",
+			"email": "qiang.xue@gmail.com",
+			"homepage": "http://www.yiiframework.com/",
+			"role": "Founder and project lead"
+		},
+		{
+			"name": "Alexander Makarov",
+			"email": "sam@rmcreative.ru",
+			"homepage": "http://rmcreative.ru/",
+			"role": "Core framework development"
+		},
+		{
+			"name": "Maurizio Domba",
+			"homepage": "http://mdomba.info/",
+			"role": "Core framework development"
+		},
+		{
+			"name": "Carsten Brandt",
+			"email": "mail@cebe.cc",
+			"homepage": "http://cebe.cc/",
+			"role": "Core framework development"
+		},
+		{
+			"name": "Timur Ruziev",
+			"email": "resurtm@gmail.com",
+			"homepage": "http://resurtm.com/",
+			"role": "Core framework development"
+		},
+		{
+			"name": "Paul Klimov",
+			"email": "klimov.paul@gmail.com",
+			"role": "Core framework development"
+		},
+		{
+			"name": "Wei Zhuo",
+			"email": "weizhuo@gmail.com",
+			"role": "Project site maintenance and development"
+		},
+		{
+			"name": "Sebastián Thierer",
+			"email": "sebas@artfos.com",
+			"role": "Component development"
+		},
+		{
+			"name": "Jeffrey Winesett",
+			"email": "jefftulsa@gmail.com",
+			"role": "Documentation and marketing"
+		}
+	],
+	"support": {
+		"issues": "https://github.com/yiisoft/yii2/issues?state=open",
+		"forum": "http://www.yiiframework.com/forum/",
+		"wiki": "http://www.yiiframework.com/wiki/",
+		"irc": "irc://irc.freenode.net/yii",
+		"source": "https://github.com/yiisoft/yii2"
+	},
+    "replace": {
+        "yiisoft/yii2-bootstrap": "self.version",
+        "yiisoft/yii2-composer": "self.version",
+        "yiisoft/yii2-debug": "self.version",
+        "yiisoft/yii2-gii": "self.version",
+        "yiisoft/yii2-jui": "self.version",
+        "yiisoft/yii2-smarty": "self.version",
+        "yiisoft/yii2-swiftmailer": "self.version",
+        "yiisoft/yii2-twig": "self.version",
+	    "yiisoft/yii2": "self.version"
+    },
+	"require": {
+		"php": ">=5.4.0",
+		"ext-mbstring": "*",
+		"lib-pcre": "*",
+		"yiisoft/jquery": "1.10.*",
+		"phpspec/php-diff": ">=1.0.2",
+		"ezyang/htmlpurifier": "4.5.*",
+		"michelf/php-markdown": "1.3.*"
+	},
+	"autoload": {
+		"psr-0": {
+            "yii\\bootstrap": "/extensions/bootstrap/",
+			"yii\\composer": "/extensions/composer/",
+			"yii\\debug": "/extensions/debug/",
+			"yii\\gii": "/extensions/gii/",
+			"yii\\jui": "/extensions/jui/",
+			"yii\\smarty": "/extensions/smarty/",
+			"yii\\swiftmailer": "/extensions/swiftmailer/",
+			"yii\\twig": "/extensions/twig/",
+			"yii\\": "/framework/yii/"
+        }
+    }
+}