Removed the unneeded signal processNetworkRequest. Added a Custom Detail
class to handle the Google contact attributes not supported by
QtContacts. There are still some attributes (like postal attributes)
that need to be handled further. Modified GContactEntry to make use of
the new GContactCustomDetail details. Fixed a bug in GTransport wherein
a signal is now issued when the sync is finished finally and not
immediately for every readyRead().

Signed-off-by: Sateesh Kavuri <sateesh@mobilitas.co>