added navigation drawer and mycourses fragment
replaced displaycoursesactivity with fragment

displaycoursesactivity functionality now moved to MyCoursesFragment,
navigation drawer works
matched custom list with simple list item 1
cleaned up code for handling course removal and roster retrieval
creating abstract activity class to reduce code redundancy
converted login activity to use fragment
recoded loginactivity as fragment for authactivity
recoded displayusersactivity as fragment
cleaned up unused code
minor login bugfix