Merge pull request #54 from chives/dev

Fixed passing values to single's action template block
documnentation for collection column type
quickfix
Change example output
Merge pull request #51 from partikus/dev-docs-collection

Add collection column to docs #44
Fix backtick
Merge pull request #55 from partikus/dev-docs-collection

Fix backtick for collection column type
Make twig global variables available in datagrid theme blocks
Added info about passing variables to datagrid theme
Docs improvement
Merge pull request #49 from chives/1.0

Make twig global variables available in datagrid theme blocks
Added php 5.6 to travis build matrix