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
Allow null values for fields in batchInsert
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
Document commit 7ce4702 (Allow nulls in batchInsert) in CHANGELOG
fixed typo
Merge pull request #2531 from tof06/master

Add getIsPjax method to Request, and add X-PJAX-URL header when redirect from pjax request
CS fix.
Merge pull request #2526 from skotos/master

nulls in batchInsert. Patch available.
CS fix.
doc typo
Coding standards fixes.