Fix issue #209 default timezone

better have timezone fix in application

[WIP] Gettext support

app is resposible for setting time zone, so it should also do the
fixing.
+ documentation about the behavior.
issue #210 and #209

RBAC sql files a little identation fix

RBAC sql files

Suggest \yii\rbac\DbManager some Db fields renaming

[WIP] Auth manager

set application timezone early in application constructor, set default of UTC if no timezone is configured at all (not in app config nor in php.ini)

Enhance ArrayHelper with popValue method

Added and resolved Sqlite tests #15.