* upgrade to okhttp 3.3 to reduce HTTP/2 incompatibilties
* vcard4android: enable RFC 6868 support in ez-vcard
* minor improvements and bug fixes
* new translations from Transifex
* version bump to 1.0.9
* use weak references for DavService RefreshingStatusListener
* additional null checks for cases which shouldn't appear, but apparently appear
* additional database conflict handling for cases which shouldn't appear, but apparently appear
* setup by URL: null check for empty host names
* vcard4android: upgrade to ezvcard 0.9.10
* catch IllegalArgumentException from HttpUrl in DavResourceFinder (caused crash when logging in with email "test@server/withslash")
* use IteratorChain in DavService collection enumeration
* task list synchronization: don't set VISIBLE=1 and SYNC_ENABLED=1 at every sync, but only at creation
* task list synchronization: sync only task lists which are SYNC_ENABLED
* honor "manage calendar colors" account setting for task list colors, too
* add run-tests-connected.sh, to be used as pre-commit hook
* ical4android/vcard4android tests
* fetch translations from Transifex
* version bump to 1.0.7
* increase target API level to 23 (Android 6), which makes Android 6-style permissions mandatory
* AUTHENTICATE_ACCOUNTS permission is only required up to API level 22
* new activity: PermissionsActivity which shows missing permissions and provides buttons to request them
* DavService: Android shouldn't send a null Intent, but sometimes it does, so implement null check
* LocalTaskList: tasksProviderAvailable may return true on API level 23+ even if permissions are not sufficient
* SyncAdapterService: show a notification (with Intent for PermissionsActivity) when permissions are not sufficient
* when creating accounts, set OpenTasks sync always to true if API level is 23+ (even if OpenTasks is not installed [yet])
* update Lombok
* new setting: only sync in WiFi (or when sync is triggered manually)
* new setting: only sync in specific WiFI (by SSID)
* lower default sync interval when account is created to 4 hours (was 1 day)
* version bump to 1.0.6
* use last path segment as collection display name if there's no DAV:displayName
* add Contacts Provider Settings again to show contacts without groups in all clients (bluetooth cars etc.)
* add ACCOUNT_NAME and ACCOUNT_TYPE when creating calendars
* close TaskProvider when checking for its presence
* when TaskProvider is not available/accessible, explicitly disallow task sync at account creation
to prevent further crashes
* try to handle OutOfMemoryError
* version 1.0_2
* add account setting + GUI: restrict time range in the past
* add support for restricted time range VEVENT synchronization
* fix bug in handling changed exceptions of recurring events
* CalDAV/CardDAV resource list views now always contain all elements without scrolling (NonScrollingListView)
* synchronization action in activity now overriddes system sync settings
* resource detection: ignore 404 errors when trying context paths
* work around crash when edit field is changed while there is no acitivity (???!)
* dav4android: fix calendar-multiget request
* CalendarSyncManager/TaskSyncManager: only set calendar name and color on sync when data is available
* DavResourceFinder: test getCurrentUserPrincipal
* dav4android: use java.util.ServiceLoader, resilience against multi-status with <propstat> without <status> + test
* ical4android: always set HAS_ATTENDEE_DATA to 1
* vcard4android: small fixes
* merge translations from Transifex
* write report to temporary file in external cache dir before sending
* don't delete the report file onActivityResult (because services like the email service may access it asynchronously)
* don't show label of installer (just the package name), because some use ambiguous strings like "App Store" etc.
* show sync. settings for all accounts again
* ical4android: treat empty-string task location and URL as null values
* vcard4android: ignore raw contact data without MIMETYPE
* gracefully ignore when server doesn't sent Content-Type in GET responses
* merge translations from Transifex
