WIP: Upgrading to Bootstrap 3.
Fixing delete button and improving create folder field.
Fixing change password form formatting.
Removing unsupported nav elements.
Fixing mobile & IE8.

Fixing IE8 required respond.js, which in turn required making Bootstrap & Font Awesome CSS local.
Adding loading page for file diff & compacting version links.
Improving link popup display.
Fixing attribution modal.
Fixing styling on password set/reset pages.
Fixing classes for change password match check.
Merge branch 'bootstrap3'. Resolves #53.

Popover bug in twbs/bootstrap#8880 is still a problem.