[documentation] improve Sphinx support
improve support for composite keys
Added CONTRIBUTING.md file
Merge pull request #332 from Bladrak/contributing

Added CONTRIBUTING.md file
update composer.json to use Symfony2.3
Bootstrap3 compatibility
revert to jQuery.Dialog
Updated button classes
Merge pull request #336 from Bladrak/improveDesign

Updated button classes
Scrollable dialog
Merge pull request #337 from Bladrak/dialog

Scrollable dialog
Added outline class to buttons
Merge pull request #338 from Bladrak/outline

Added outline class to buttons
Update list_field_definition.rst

to have 'route' params accessible, you need to use "addIdentifier" and not a simple "add"
Merge pull request #339 from faboo03/patch-1

Update list_field_definition.rst
Replaced dialog with bootstrap3 modal
Factorized modal template
Merge pull request #341 from Bladrak/dialogToModal

Replaced dialog with bootstrap3 modal
Fixed modal when error in form
Merge pull request #342 from Bladrak/modalFormError

Fixed modal when error in form