core dashboard functionality

+ isolated engine
+ automatically mounted under "/cms/dashboard"
+ responsive design
+ simple print styles
+ updated README and CHANGELOG
+ adopted "distance_in_words" translations
+ configuration holding all yml files
adds dashboard tests

+ updates gem dependencies
+ ignore configuration files in dummy application
+ bugfix: actions could have been requested from remote
merge develop into feature/dashboard
Merge branch 'develop' into feature/dashboard

* develop:
  bugfix: used wrong homepage path
  updates google analytics to use variables set in the generator
  allows to check if an obj_class or attribute already exists in the CMS
  updates base classes and their attributes
  updates and extends README
  bugfix: dummy test application needs crm_connector initializer
corrects spelling and adds links to cms and crm news
handles case, when there is no github repository attached to the repository
Merge pull request #2 from infopark/feature/dashboard

Feature/dashboard