Background starts your process without waiting for ready

Signed-off-by: Simon Leung <leungs@us.ibm.com>
signmon starts propogating signals before ready is called

Signed-off-by: Simon Leung <leungs@us.ibm.com>
ProcessGroup implements a stub for ready

Signed-off-by: Simon Leung <leungs@us.ibm.com>
ginkgomon implements gbytes.BufferProvider

Signed-off-by: Simon Leung <leungs@us.ibm.com>