Raw content return for Grid DataColumn & Column

Need to have a method  `getDataCellContent` to return raw parsed data cell content. This is useful when extending these Columns, for processing any other data before formatting via `renderDataCellContent`.
Raw content return for Grid DataColumn & Column

Need to have a method  `getDataCellContent` to return raw parsed data cell content. This is useful when extending these Columns, for processing any other data before formatting via `renderDataCellContent`.
Raw content return for Grid DataColumn & Column
Raw content return for Grid DataColumn & Column
Removed unnecessary blank space
Removed unnecessary blank space
first draft of the extension generator
Merge branch 'master' into feature/gii-extension-generator
added asSize method to format file size #2524
Merge branch 'master' of git://github.com/yiisoft/yii2 into 2524-formatter-format-file-size
no need for as number #2524
minor docs update (still WIP)
Merge commit 'fcac7f64b37c6a8d4ead9816b2580f50580c540d' into feature/gii-extension-generator
#2524 updated as size method to include translation and verbose mode
updated formatting
updated code according to code style and removed unused property
updated changelog
updated defaults, UI, validation and templates
Merge branch '2524-formatter-format-file-size' of github.com:VinceG/yii2 into VinceG-2524-formatter-format-file-size

Conflicts:
	framework/CHANGELOG.md
Adjusted code formatting