fix Issue #731 - position should stay the same after ->flush()
Merge pull request #732 from Cethy/master

fix Issue #731 - position should stay the same after $em->flush()
fix Issue #502 - changing groups should update positions for the old groups
Merge remote-tracking branch 'cethy/master'

* cethy/master:
  fix Issue #502 - changing groups should update positions for the old groups
Optimize autoload prefix in composer.json
Merge pull request #738 from Slamdunk/patch-1

Optimize autoload prefix in composer.json
Merge branch 'master' into timestampable-change-fields