Added time.monthName(month) and time.dayOfWeekName(day)

Ordinarily would wait for more to commit, but I've been having BAD
experiences with git latelty.
Addded a couple more time functions

Concludes my plans for time.js
Removed functions I THOUGHT were overloaded but were undefined

functions are monthName(), dayOfWeekName() and isLeapYear(). 
Use time.monthName(time.month()) etc. instead
Merge pull request #37 from Nateowami/master

Finished time.js