[Bug 1058671] Improvements to GeoIP locales.

* Cache the GeoIP data in cookies that expire after 30 days.
* Only make a request to geo.mozilla.org if the cache isn't available.
* Only do GeoIP detection for en-US
* Don't break when the script doesn't load, for any reason.
Don't error when there are no .pycs to remove.
[bug 1055796] Add Firefox Sync to AAQ
[bug 795871] Fixes issue with focous on Mozilla Support Logo