heat docs : Update jeos building documentation

Replace references to heat-jeos with documentation describing the
use of the new heat-templates/tools/heat-jeos.sh example script

fixes bug #1171602

Change-Id: I88fd2a5667cccd79a77c4a663c782fb537279fac
Make Resource.create() a co-routine

At the moment, we will just run each co-routine to completion, but in
future we can use this to return control to the caller so that resources
may be created in parallel.

Change-Id: I5c2daf3839e53d855acb73fc4288b5be76794c7f
Merge "heat docs : Update jeos building documentation"
Merge "Make Resource.create() a co-routine"