Show due_date changes on comments

Also, add compass for the ui
Enable process_params on backbone.sync
Add comment dates and change task date formats

Dates are relative to current date for the first month.
After that, they'll be in DD/MM/YYYY
Merge branch 'dates'
Fix insecure content warning by serving https files
Change task for comment in comment due dates classes
Merge branch 'add-date-related-comments'

Conflicts:
	public/index.html
Merge branch 'fix-insecure-content-warning'
Merge branch 'master' of https://github.com/Juanxo/backbone-teambox-tasks