Adding in-app purchase.
Still not yet been tested.
For testing we need to re-upload the application with the current
permissions, add the "purchased" items and create test account to test
buying.
Merge branch 'in-app-billing'

Conflicts:
	MadaReports/res/layout/fragment_home.xml
	MadaReports/src/com/mdareports/ui/fragments/HomeFragment.java