Merge branch 'release/v1.4.0'

* release/v1.4.0: (24 commits)
  Updated dependencies
  Added changelog to README
  Fixed headline in README
  Updated README
  Collection fields now add the data-prototype attribute
  Fixed bug in Configuration
  Fixed bundle name in README
  Improved CS integration
  Fixed Makefile newline
  Added Code Sniffer and PHPMD and fixed some issues
  Improved layout of global error messages in forms
  Made output directory configurable
  Changed namespaces in README
  Bump version
  Menu matching works with KnpMenu dev-master and v1.1.*
  Assetic configuration
  KnpPaginatorBundle configuration
  Fixed missing method call
  Refactored extension
  Configure KnpMenuBundle
  ...
Possibility to switch between less and lessphp
Merge branch 'hotfix/v1.4.1' into develop

* hotfix/v1.4.1:
  Possibility to switch between less and lessphp