FIX - Application crash upon configuration change (orientation). [Event handler was built with a new statement but its reference was lost in the change].
REFACTOR - Changed also spinner handlers of the main screen.
FIX - Learnt how to get references to actual fragments (building their tag) within the ViewPager. This was useful to triggering UI updates in the different fragments.
MINOR - Small optimizations in fragment UI update strategy.
Merge branch 'master' of https://github.com/fransis1981/Hymns_for_Android into master-remote