0.3.16

0.3.16:
o first working mdigest support implemented
o fixed change credentials on webOS 3.x and LuneOS
o categories are now stored for contacts, too and send back to server,
so they do not get deleted
o imporved network code for webOS 3.x and LuneOS
o implemented retry mechanism if upsync fails. Prevents deletion of
failed upsyncs.
o Allows to ignore certificate errors on webOS 3.x and LuneOS
2014-09-10: Achim Königs <garfonso@mobo.info>