Refactored homepages for different user types
Added /search_questions/ urls
Added 'Questions related to:'
Dont show sidebar for unauthenticated user
Show "Don't see the info you need? Ask your question!" for students only
Renamed search_results_x templates back to homepage_x
Merge branch 'feature-new-search-results' into v2UI

Some notes on conflict resolution: selected Blaise's append_results approach for the bottom of question list pages like homepage and search results.

Conflicts:
	forum/skins/default/templates/v2/homepage_base.html
	forum/skins/default/templates/v2/homepage_student.html
Fixes duplicate template tag.
Merge branch 'v2UI-style' into v2UI