Bug 859564: University Ambassadors form.

Student Ambassadors page styling.

Add base styles

updated responsive layout

add input placeholder js shim

Bug 859564: Fix data and form issues.

Derevert "[bug 859564] Add /b/ redirect for /contribute/universityambassadors/"

This reverts commit 1caa09be059e8d4522897baa6a7f2699b335cf4c.

Update to match new requirements from Jess.

Bug 859564: Fix tests.

Bug 859564: Redirect on successful submit.
Merge pull request #834 from glogiotatidis/ambassadors

[bug 859564] Add student ambassadors form.