Student Home Page Spinner

* Pull available subjects from server
* TODO: Look up tutors with chosen subject
Merge branch 'master' of https://github.com/queeniema/Edufi
Added functionality for inserting subjects into corresponding tables for tutors/students
Minor changes
   * Reformatted tutor home layout
   * Removed checkboxes in student setup
   * Added log out functionality to action bar
Merge branch 'queenie' of github.com:queeniema/Edufi into queenie