PIM-1348 : use single table inheritance to store variant groups
Fix behat scenarios on variant group edit view
Fix delete variant group on edit view
Remove default sorting on variant products datagrid
Fix edit variant group behat scenario
PIM-1239 : Create MediaManagerException and catch problems come from gaufrette
PIM-1239 : Display error message on view
Do not use DB root user for application
Merge branch 'master' of github.com:akeneo/pim-community-dev
Merge pull request #379 from akeneo/PIM-1239

PIM-1239 Good work !
cache metadata should work now with our own audit implementation
Merge branch 'master' of github.com:akeneo/pim-community-dev
PIM-1300 : add group type
PIM-1300 : add group type in group
PIM-1300 : add type column in group grid
PIM-1348 : add group type installer file and related data fixtures
PIM-1348 : move attribute group installer file
PIM-1348 : add basic group types
PIM-1348 : rename attribute group fixtures
PIM-1348 : rename attribute group and variant group expected files