Changed zeroPad method to do tail-padding as well
zeroPad tests
Ignore the tests directory in volo
Bugfixes and new tokens
strftime tests
Added shiftTime method
Added ability to parse timezone using %z token
Fixed zeroPad problem with 0
ISO formatting and parsing and fixes to timezone handling

* Forgot JavaScript has its timezones in reverse... :)
* Use setMinutes instead of shiftTime. shiftTime is broken although it should
  work in theory
Updated tests