Pref screen added. DNI modularized

Switched to DNI methods. This should make it easier to further moduralize it. Added basic prefrences screen for < HC. Not currently working on HC or higher.
Working. Needs work on pause/restart
Working everything.
Merge branch 'prefs'

Conflicts:
	src/com/suicune/notasupna/LoginActivity.java
	src/com/suicune/notasupna/PreferencesActivity.java
	src/com/suicune/notasupna/RecordFragment.java
	src/com/suicune/notasupna/Student.java

Fixed differences between branches. RecordFragment needs A LOT of working.
Solved previous merge issues with Record and Student