ADD communication machanism between API and Service

Signed-off-by: Richard Lea <chigix@zoho.com>
FIX data abstract bug for ChigiReturn Object

Signed-off-by: Richard Lea <chigix@zoho.com>
ADD support for calling getMsg without params so as to auto-switching.

Signed-off-by: Richard Lea <chigix@zoho.com>
Update documentation for ChigiApi,ChigiService and miscs.
Update the version to 1.7.9

Signed-off-by: Richard Lea <chigix@zoho.com>