GII - echo short syntax [skip ci]
Extra space [skip ci]
renamed composer installation type.
renamed composer installation type.
adjusted calling sequence within init().
removed unused use statement.
Merge pull request #1038 from lucianobaraglia/master

GII - short echo syntax
Merge branch 'master' of github.com:yiisoft/yii2
Added extension initialization to application life cycle.
Dropped support for supporting default namespace for classes of related models.
Docs typo [skip ci]
Merge pull request #1040 from lucianobaraglia/master

Docs typo [skip ci]
more on short array syntax
another typo fix
no need to check for trait_exists in autoloader anymore
added replacement class for intl MessageFormatter
as we have a replacement, do not check for intl MessageFormatter
Renamed InstallerPlugin to Plugin
cleaned up Installer.
removed InstallHandler.