Added "Leil Selichot" on Saturday night at least 4 days before Rosh Hashana. Fixes #47.

To quote Wikipedia: "In the Ashkenazic tradition, it begins on the Saturday night before Rosh Hashanah. If, however, the first day of Rosh Hashanah falls on Monday or Tuesday, Selichot are said beginning the Saturday night prior to ensure that Selichot are recited at least four times."

http://en.wikipedia.org/wiki/Selichot#Selichot_of_the_High_Holidays
Merge branch 'master' of git://github.com/hebcal/hebcal