removed recurrence sample
changed license to agpl v3
Deleting email-folders is now possible

If a "normal" mailfolder will be deleted it will be moved to the
trash-folder. If a mailfolder in the trash-folder will be removed
it will get erased completly.
Merge branch 'master' of github.com:z-push-ox/z-push-ox
extended README.md
as of revision 1558 (will be Z-Push 2.1.0) Z-Push requires contentParameters to implemented in all diffbackends
this regards the functions ChangeMessage, DeleteMessage and SetReadFlag

https://jira.zarafa.com/browse/ZP-273
fixed some small bugs introduced in code refactoring
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
partially adressed issue #4 - properly support meetingstatus
implemented appointment deletion
added featurelist to readme
cleanup
readme formatting
added requirement for ox 7.2.1 due to issue #5
added featureset for contact sync to readme