Version 0.4.4

* allow to enter account name at the end of account setup (fixes #13)
* advise user to enter email address as account name (closes #24)
* support for iCal TRANSP (availability free/busy field)
* create better UIDs using iCal4j UidGenerator and Settings.Secure.ANDROID_ID
* better ORGANIZER/ATTENDEE support, but there are big Android issues yet
* various improvements and bug fixes