Add ability to filter edited pages
Update PageManager to be able to return a DataGrid for API + Add new filters to API, 'edited' and 'root'
Return pager instead of custom array for API PostController::getPages()
[API] Add ability to filter pages by site id + List page child pages
[API] Add ability to filter pages by parent id
Add Api Site resource
Introduce new DatagridBundle
Fix typo
Fix docblock
Merge pull request #319 from plouc/api_improvements

[WIP] Api improvements
Merge remote-tracking branch 'sonata-project/master'

Conflicts:
	composer.json