Added Restricted Pool of Tags capacity to TagTagger

just added the ability to add a restricted pool of tags to TagTagger, so that if you wanted to have non-free-form tags to reduce n to a quantifiable amount, you can
small Fix

Just realized TagTagger uses a different var to pass tagdata, so using that now
Added Callbacks

Added Callbacks for 
onCreated, onRemoved, onDuplicate, onNotInPool, and onBlank
All arguments expect one argument which is either the tag entered or the text of the tag removed...
Merge pull request #2 from Lewiscowles1986/master

Added Callbacks And Tag Pool