Fixed bugs related to setting email, initialization of transport,
parser, auth and contacts objects in GContactClient. Modified the name
of the cilent plugin to googlecontacts and added a client profile.
Removed unnecessary methods in GParseStream. Added a slot
handleNetworkError in GTransport. Added unit testcases for
GContactClient and GContactsBackend

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