Merge branch 'master' into iss24
Merge branch 'iss24' into login
Changed to db-session-storage
added presence validations to user-model
eabled assets-digest for caching over http-relays
Merge branch 'master' into login

Conflicts:
	app/views/user_assignments/index.html.erb
	test/functional/user_assignments_controller_test.rb
Merge branch 'login' into iss24
fixed accidentially merge-conflict
removed merge conflict, added password-handling w SHA2-hashing
added configuration-attribute for hash-rounds
added session-handling
switched to ruby-privacy for method
added configuration-attribute for session-timeout
added controller for session-management
corrected config-variable-name
removed session-controller
added before-filters for session-management
changed redirect-directive
tried to fix semantic-ui-error
fixed spelling