possible fix to mdigest issue.
added categories field to contacts, store & upsync.

It is not used in webOS (yet).
fixed service hanging if proxy connection fails.
added a secret tweak to ignore wrong certificates

Need to learn to use tweaks, I guess... ;)
store ignoreSSLCertificateErrors per account in database.
added retry mechanism if upload fails.

Upload will be retried on next sync  occasion.
copied better message-retry mechanism from legacy client
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>
Merge pull request #57 from webOS-ports/Garfonso/work

latest improvements