[fix bug 997666] Use mozillians_field on profile.skills.

Switch from custom code to mozillians_field() helper to:
 * Make code consistent and avoid custom code.
 * Display skill errors
[fix bug 997455] Remove skill JS validation.

Removing outdated client side skill validation code. We do validate
skills in python.
[fix bug 995950] Remove jsi18n references.

We don't use django's built in javascript translation tools. This commit
removes related code.
Merge pull request #906 from glogiotatidis/997666

[fix bug 997666] Use mozillians_field on profile.skills.
Merge pull request #905 from glogiotatidis/js-skill

[fix bug 997455] Remove skill JS validation.
Privacy policy url fixed
Merge pull request #911 from birajkarmakar/master

[fix bug 997346] Privacy policy url fixed
Merge pull request #908 from glogiotatidis/remove-jsi18n

[fix bug 995950] Remove jsi18n references.
[Fix Bug 997346] Fix additional privacy policy url locations
[fix bug 998250] Update fraud report link.
[fix bug 998264] Update footer links.

* Add 'Contact Us' link in footer.
* Update license link
[bug 965828] Tastypie upgrade.

- Upgrade tastypie to 0.9.16
- Remove Country and City resources.
[fix bug 845593] Update Playdoh and upgrade to Django 1.5.5

Django 1.5.5 compatibility changes.
Merge pull request #889 from glogiotatidis/965828

API and Django upgrade