Added parse_path util to (hardcoded for now) break up paths into tokens
Only display checkboxes for tokens that match tags
Auto-check checkboxes for currently applied tags - TODO Change to colouring as all present tags should be auto-checked
Add dummy form submission and new dropdown layout
Calculated the additions and subtractions in terms of tokens
Calculated which Tags to be added/removed for each image
Ready to save changes to server
Load jQuery & ajaxForm if needed
Refresh tag table after form processing