Added the privileges of the coordinator and the member in the constants file
Added the coordinator controller and view
Wrote a function in the userdb model that returns the usernames of all the registered student members.
Added the security features in updateSearch, updateCalling and editProfiles.

Now, only student members can edit the profile of an alumni. Coordinators can't edit the profile.

The status functions have been made almost private. Before executing they will check the allotment and that the user who is logged in is a student member. And then execute the function.
Merge pull request #24 from icyflame/fix-edit-profile-privileges

updateSearch and updateCalling are not public anymore.