Implementation of the words to avoid functionality
- added to MGTags Component a method listing tags with a compound weight above a certain level
- added wordstoavoid to Zentag, words that have been listed as to avoid are weight as 0
- added type column to tag_use to have a record who was repoinsible for the weigthing of this tag_use
- added words to avoid threshold input field to ZenTag
- smaller clean ups in GamesController
- added comments to several methods