Add and configure latest z-push

Signed-off-by: PajamaSoft <support@pajamasoft.com>
Add zpush_timezone setting for testing vars

Signed-off-by: PajamaSoft <support@pajamasoft.com>
Update README to include information about Z-Push.

Signed-off-by: PajamaSoft <support@pajamasoft.com>
Add tests for zpush
Remove zpush usage from README in favour of Usage wiki page.