Better student profile views + better student search

Ok, so the same pull request as before, but this time it should be automatic once someone checks it :)

Basically I have done two things (next time I'll separate them in two branches):
- Implement more functionality in search:
 * Case insensitiveness
 * Advanced search (only in the view so far)
 * Pagination
- Recreate user profile views in HAML using bootstrap