Firefox /firstrun A/B tests. Bug 865433.

- Abstracted simple footer from /firefox/new/

- Added L10n strings block to templates/base.html

- Fixed L10n comment case typo on /firefox/partners/index.html

- First crack at general modal JS (media/js/mozilla-modal.js)
Merge pull request #867 from mozilla/bug-865433-first-run

New /firefox/firstrun/ views
Video tracking tweak, GA experiment added. Bug 865433.

- Avoid pause tracking when video ends.

- GA experiment code added to base /firstrun page.
Merge pull request #868 from mozilla/bug-865433-firstrun-updates

Video tracking tweak, GA experiment added. Bug 865433.
Fix bug 859572: Redirect tabzilla.js to CDN.
Merge pull request #851 from pmclanahan/redirect-tabzilla-cdn-bug-859572

Fix bug 859572: Redirect tabzilla.js to CDN.
May devices update - devices.csv
Merge pull request #870 from AaronMT/may-devices-update

May devices update - devices.csv
Convert big png's to smaller jpg's. Bug 865433.
Merge pull request #871 from jpetto/bug-865433-firstrun-optim

Convert big png's to smaller jpg's. Bug 865433.
Bug 816080: Upgrade Bedrock to latest Playdoh
Bug 816080: Revert rename of wsgi file to ease deployment pain.
Bug 816080: Add a dummy db and cache config for easy setup and deploy.

Django 1.4+ requires a db setting to run at all.