fixed search issues in courses
Merge branch 'ViewPager' of https://github.com/prolificcoder/coursera-ratings into ViewPager
Removing onActivityResult method because it is causing crashes when clicking back button.
Added Facebook SDK as a subfolder and including it as a library
Removed Facebook login and added custom parse user login, signup and sign out. Also options menu on main activity. Upvote and down vote can only be done once per user, per course.
Fixed bug with typo and added menu options to course details
Now removed Facebook for real