added gitignore
added code from tine2.0 to convert activesync timezones to php/ox timezones
the files are of tine's commit 4a6023e1ea8dc509fa92159496c18003c14dcd62
added function to convert timestamp from one timezone to another
added wrapper code for tine2.0 activesync code to be used in OXUtils
prettify
simple timezone support for calendar module
code refactoring
support for timezones in mapping