Rebased: 11_tagging
 #11: Users can tag tickets upon creation

 #11: Users can add tags when adding a comment

 #11: Added remove tag functionality

 #11: Add label-based searching for tags using Searcher

 #11: Added ability to search tags by name and ckick on tags
Merge pull request #1 from MavkaPoltavka/11_tagging

Rebased: 11_tagging