add authentication! method to concerns, make available user crm_contact as well as crm_attributes
Merge branch 'develop' into feature/authentication

* develop:
  refactoring: it seems to be more common to depend on "consider_all_requests_local" instead of the rails environment
  bugfix: correct contact_page_generator_spec name
  exception handling enabled for development environment
renames user_presenter to login_presenter
refactors authorization into before filter
refactors user management

+ adds application wide user_manager and implements WebCRM user manager example
+ lazy loads user attributes
+ adds further user attributes
+ wraps user manager errors to decouple from specific implementations
+ cleans up authentication
updates CHANGELOG and minor changes
Merge pull request #5 from infopark/feature/authentication

authentication methods