FIX - Circle buttons remained in pressed state even if user swyped off button's limits.
STYLE - Styled circle buttons according to main theme.
NEW - Implemented SingleHymn Activity by means of fragment (to support incoming tablet layout).
Merge branch 'master' of https://github.com/fransis1981/Hymns_for_Android into master-remote
NEW - Implemented Main Activity by means of fragment (to support incoming tablet layout).
MINOR - Assumed main language to be English; provided Italian strings into values-it
FIX - Multiple Single Hymns instances were launched when composing a chain of valid hymn numbers.
FIX - Keypad timeout must stop if user navigates changes the current tab.
NEW - Introduced XML file with version number