Partial pick: Get rid of top sub menu, move 'Contact Us' link to the top
menu, improve styling

(cherry picked from commit evernote/pootle@e09b735e)

Pick notes: The cherry pick notice above is from Evernote. Some of the styles
    were not picked because they altered the color scheme, or rendered an
    ugly UI. Also had to adjust the template changes because we had the
    "contact us" link in the footer. Also we keep checking the CAN_CONTACT
    setting. Adjusted the changes in the template to minimize having to
    pick minor tweaks as unrelated changes in further commits.

Conflicts:
	pootle/static/css/style.css
Don't display captcha for logged-in users

Pick note: Had to move the changes to our contact app.

Conflicts:
	pootle/apps/evernote_contact/forms.py
Pre-populate title with a sane default
Display captcha field inline

Pick note: Minor conflict because of some Evernote specific CSS we didn't
    pick earlier.

Conflicts:
	pootle/static/css/contact.css
Remove title to work around remnant tipsy bubbles
Display labels in a more subtle color to make the form data stand out
Partial pick: Styling improvements

(mostly the top header and corporate Evernote fonts in headings)

Pick notes: Didn't pick the Evernote corporate changes. Also didn't pick
    the breadcrumbs dropdowns changes, because they break the display of
    the Select2 dropdown controls. Also didn't pick some color changes.
    And instead of commenting one of the changes, just removed it to
    don't pick the next commit that removed it (the rest of the changes
    in that commit don't apply since are for stuff we didn't pick here).

Conflicts:
	pootle/static/css/sprite.css
	pootle/static/css/style.css
	pootle/static/images/sprite.png
	pootle/templates/layout.html
Partial pick: Remove About and Contributors pages since these are replaced with manually crafted static pages; improve rendering of static pages

Pick notes: Just picked the changes related to staticpages. The exception
    is one minor style for staticpages (and also about) padding that was
    not picked because of the visual effects on the about page we keep.

Conflicts:
	pootle/apps/pootle_app/views/index/contributors.py
	pootle/apps/pootle_app/views/index/urls.py
	pootle/static/css/style.css
	pootle/templates/about/about.html
	pootle/templates/about/base.html
	pootle/templates/layout.html
Partial pick: Styling improvements

Pick notes: Didn't pick the styles for the hovering over the top bar items.

Conflicts:
	pootle/static/css/style.css
Cleanup: Remove opacity styling using filter

This was necessary to support old browsers.
Bigger textarea for static pages editor; added some quick help on linking pages
Fix static page retrieval via XHR calls
Simply ignore the header block altogether
Partial pick: Cleanup: removed obsolete styling declarations

Pick notes: Just picked the changes for `topcontributors`, `documentation`
    (actually the content of the about page), and one of the changes for
    `#about` (since we dropped all of the `documentation` and we want to
    keep the white background).

Conflicts:
	pootle/static/css/style.css
Followup: Minor adjustments to recover the zoom for the about page
Cleanup: Remove unused template code

We removed this class a few commits before
Fix the blank space below the top header
Silent unused empty blocks

Pick notes: Just had to drop two removed templates. This changes will be
    applied to several other templates in a followup commit.

Conflicts:
	pootle/templates/auth/link_with_evernote.html
	pootle/templates/login.html
Nit: Add blank line between extends and load

Minor readability improvement.
Cleanup: Apply the guidelines for template inclusion