Previously, the Heat demo suffered from the following limitations:
1. The number of Nova instances to spawn and the image flavor were
hard coded in the Heat template.
2. No outputs existed. This required users to run nova-list to
obtain the IP's of VMs.
3. No documentation existed.
This patch addresses the above limitations.
Change-Id: I495aa9c73a91200c01cecc1719ee5532c1f6c9cb