Bug 768507 responsify

Responsify all remaining bedrock pages except for the /firefox/* pages that should be reviewed to see what will be removed/replaced/redesigned before we spend time responsifying.

Pages responsified are:
/dnt
/firefox/update
/firefox/geolocation
/firefox/organizations
/firefox/organizations/faq
/collusion
/collusion/demo

The sand.html and mozorg/base.html templates have also been removed as they are obsolete.