AC-3: Added possibility to log in.
AC-3: Added basic error handling to login.
Merge pull request #2 from openmrs/AC-3

AC-3: Added login fucionality
Updated tests catalog name in gradle script.
Added missed broadcast receiver unregistration.
Merge branch 'master' into settingsPage-AC-12

Conflicts:
	openmrs-client/src/main/AndroidManifest.xml
	openmrs-client/src/main/java/org/openmrs/client/activities/ACBaseActivity.java
	openmrs-client/src/main/java/org/openmrs/client/adapters/ScreenSlidePagerAdapter.java
	openmrs-client/src/main/java/org/openmrs/client/application/OpenMRS.java
	openmrs-client/src/main/java/org/openmrs/client/net/AuthorizationManager.java