Ticket #17: Fix inheritance for the delay property

If a delay statement was set at the Service level it was ignored.
Now delay is took into consideration at the Action and the Service
level.

This patch fixes #17

Change-Id: Idd6ef1fb7140b8c3a4d8e1082a774816ce970975
Ticket #22: Correctly inherit 'retry' property

Correctly inherit 'retry' property from Service to Action and remove
'delay' constraint when using 'retry' (ticket #22).

This patch fixes #22

Change-Id: I65e278e02f2b12dc089aeb093df6e5675e2f9fab