adds DbUtils.java
adds private constructor to MediaUtils
refactors GrouperClient and adds request interface to Http
removes db stuff from MainActivity
adds Follower and Followee
adds User model. opts for this model instead of Follower/Followee since the data are users
adds all of the activities that i could think of
adds REQUEST_ERROR const to Http
adds GroupsJsonHandler and adds basic GroupsActivity logic
changes GroupsActivity to be a ListActivity, sets item click handler for list