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Added login Activity
Made small changes to login Activity

-Centered the text in editText with gravity instead of brute force
-Fixed the id format
-Changed textViews to editTexts
Added array of college names and improved main activity xml

-Added an array of college names
-Got rid of unnecessary file, id.xml
-Designed the signup UI
-Improved the activity_main.xml
Finalized Signup Page

-Finished Signup Page (NEEDS TO CHECK IF VALID UCSC EMAIL)
-Goes to signup page when signup button is clicked (Yay!)

-TODO fix text edits, they don't delete the word username or password
when you start typing
Added the signup page and a login page