add delete method for untagging to event_tag controller
add delete route to hit untagging method in event_tag controller
add equal and opposit ajax method for untagging
create unselected class for distinction from new tags
create untag method for Event model
updated div classes in partials to match js model
reset model after each button click to prevent buggy rendering
move buttons outside of partial to retain their bindings
refactor create and delete methods to leverage terse active record
better variable naming for event model
reorder routes so that submit feature test does not get confused
organise event model methods
Merge pull request #27 from gopher-snakes-2014/untagging

Untagging