Update composer.json

Updated composer.json with datagrid dependency to meet page-bundle requirements
changed method from public to private

Non-action public method found in controller class.
Sensio insights says so
Merge pull request #392 from covus-filipe-garcia/patch-2

changed method from public to private
Merge pull request #391 from migmolrod/2.3

Update composer.json
Fix an issue with the contexts

I was unable to get the blocks loaded in the admin selects unless I have changed this ... and it took me some time to figure out.
Merge pull request #399 from danvbe/2.3

Fix an issue with the contexts
fix name typo in routing rules
Merge pull request #406 from wryk/patch-1

fix name typo in routing rules
duplicate definition of sonata.admin.block.search_result
Fixed root names
SONATA-454 - Added asterisks on required fields
SONATA-455 - Added Select2 to demo front
SONATA-448 - Fixed order
Fixed tables names
Update comments to do not use signed interface
Update page fixtures for new header
Add missing SonataCommentBundle configuration
Update footer

Update footer
Fixed API firewall to exclude api page
Fixed knp-markdown dependency (not needed anymore)