Bug fixes for Gregorian years 1-99, Erev Rosh Hashana

For calendars generated with HebrewCalendar.calendar({isHebrewYear: true, year: 5781}), the first event returned is now Erev Rosh Hashana instead of Rosh Hashana 5781. This first event is technically in the previous Hebrew year, but conveniently lets the caller get the Erev event (for clarity) and accompanying candle-lighting times.

Fixed a handful of issues with 2-digit calendar years such as HebrewCalendar.calendar({isHebrewYear: false, year: 88})

Warning! Results for year 1752 C.E. and earlier may be inaccurate. Hebcal does not take into account a correction of ten days that was introduced by Pope Gregory XIII known as the Gregorian Reformation

2.1.3: stable

The API is now stabilized. Enjoy!