Nit: Add blank line between extends and load

Minor readability improvement.
Cleanup: Apply the guidelines for template inclusion
Adjust header margins, captcha form margins
Fix breadcrumb delimiter spacing
Updated exempt urlpattern name

Since the changes in Evernote don't apply at all (we are using completely
different apps to handle authentication) it is better to do the changes in
our own. Kept the same title for the commit.
More sensible way to silent empty top header/action blocks

Conflicts:
	pootle/templates/auth/link_with_evernote.html
	pootle/templates/editor/main.html
	pootle/templates/login.html