add DURATION iCal->Android, collection refactoring
CalDAV: ignore collections without VEVENT support (for instance, VTODO collections)
Provide DTEND for single-time events and DURATION for recurring events to Android calendar data provider (fixes #60)
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
Fix crash bug when ORGANIZER has no URI scheme
VCard 3 support

* switch to ez-vcard instead if iCal4j-vcard
* generate VCard 3 by default (fixes #67)
* support for more phone number/email/address types, including "custom" types
* limit to 1 URL and 1 note (Android limit)
* support for anniversaries
Add more vCard fields

* support for vCard organization (company / job title)
* support for vCard IMPP addresses (closes #105)
* refactoring
Version bump to 0.5

* don't download contact photos from URLs (we only want thumbs anyway)
* always use yyyy-MM-dd for birthdays/anniversaries
Ignore invalid IM addresses (fixes #105), Lombok 1.12.2
Version bump to 0.5.1; fix crash bug (fixes #108)
More input checks

* check Android's DURATION, RRULE, RDATE, EXRULE, EXDATE values for empty strings before processing
* catch InvalidArgumentException on invalid RRULE values from Android
* add Depth: 0 to REPORT multi-get requests as required by CalDAV/CardDAV RFCs
* fix crash bug on multi-get responses without content (see issue #113)
Amend EditSchema and VCard fields

* write PRODID with DAVdroid and ez-vcard version to VCards
* remove limit of 1 for contact Web sites in contact EditSchema
* add organization to contact EditSchema
* don't set null values in ORG/ROLE
avoid NullPointerExceptions when contact data rows with custom types have no LABEL
Version bump to 0.5.2-alpha
Fix issue with list-ids
Merge to upstream