Revert the change of the month_name_format.

LLLL is an Android extension not available before Gingerbread. A custom format can be defined by overriding month_name_format in a string resource file of the Android project that uses TimeSquare for Android.
Use standalone month name on devices that support it.
Merge pull request #74 from aahlenst/revert-month-format-change

month_name_format LLLL breaks build and API compatibility