Month indicator should not always show the startDate month when scrolled to another month.

[gregwym]

1. Create a UltraWeekCalendar with startDate and endDate in different month.
2. Scroll to a month that's later than startDate.
3. The month indicator is not updated.

User would think they are picking date inside the startDate month when they are actually in a different month. This can really be an issue when the startDate and endDate are few months apart.

[ultranano]

Fixed on 0.1.3