Merge remote-tracking branch 'upstream/master'

* upstream/master: (67 commits)
  Loose twig dependency
  Use console as console.phar
  Remove sudo
  Travis migrate to container-based infrastructure
  Implement SiteHelper
  Implement SiteHelper
  Register SiteHelper
  Add SiteHelper class
  Generated FieldWidget is in wrong folder
  Generated FieldType is in wrong folder
  Generated FieldFormatter is in wrong folder
  Fix FieldFormatter template
  Update version number to 0.8.2
  Add new line
  Apply phpqa using PSR2 standard
  Apply phpqa using PSR2 standard
  Update latest version of phpqa.yml
  Update to PSR2_LEVEL instead of SYMFONY_LEVEL
  Update version number to 0.8.1
  Fix issues related with Authentication Collector
  ...