crud generator WIP
Added note about the fact that PHP SSL extension is required to install all Composer dependencies
Removed DebugTarget reference from advanced app template configs
Added debug to preload in advanced app template
Exception about missing class in class file only when YII_DEBUG

See discussion about exceptions in autoloader here:
https://groups.google.com/forum/?fromgroups#!topic/php-fig/kRTVRSIJ0qE
Allow generator to define actions.
fixed FileValidator after UploadedFile refactoring

fixes #845
updated php doc
moved MSSQL specific property to mssql TableSchema
doc fix.
fixed docs in db Schema classes
Merge branch 'master' of github.com:yiisoft/yii2

* 'master' of github.com:yiisoft/yii2:
  doc fix.