Fixed date to 2014 on footer

footer has been changed to 2014
Add linting tools.

* scripts/lint.sh
* scripts/hook/lint.pre-commit
Make kitsune flake8 compliant.
Add lint checks to travis.
Update contributor.html

change in wording and new link
[bug 956836] Replace tastypie with django-rest-framework.

KPI app was using tastypie. Now it uses DRF.
[bug 956836] Remove django-tastypie from vendor.
[bug 952273] Do not escalate questions by users not active.
Clear cached tags after adding needsinfo.
[Bug 884778] Fix html5 validation of advanced search.
[Bug 941376] Add GA events to UpToDate bubble.
Move rebuild_kb to once per day.
[Bug 958612] Show Add-on ID for about:support data
[bug 952515] Stop showing escalated and offtopic by default.

Hiding and showing for these questions is via CSS now.
[Bug 958612] Fix string formatting in GA code.
[bug 961203] Update zendesk lib and change to api v2.
Update django-waffle to master tip (a5beffb15)
Update test_utils to master tip (9fa5b267)
[bug 889467] Upgrade django to 1.5.5.
[docs] Fix the name of the suite that runs on stage.