Merge pull request #819 from leider/master

replaced pick-a-color by mjolnic-bootstrap-colorpicker
Admin page that displays all interests and shows how often they have been chosen.
Refactored helper function to be as general as necessary.
Removed superfluous test.
Improved naming.
Merge pull request #820 from NicoleRauch/master

Admin page that displays all interests
Oops, Jade file was missing...
URL parameter of interests should be identical no matter whether it is created in the frontend or in the backend.
Test for the removal of parentheses in the backend.
We cannot remove strange chars from the interest because we will not be able to find the modified interest in the DB any more.
Merge pull request #822 from NicoleRauch/master

Small bugfix in frontend interests - removal of strange chars does not work...
FIX: fine-tuning for the interest-cloud: it didn't display, if there is a word containing a '"' in the interests