create stack if it does not exist
Added GET /v1/data_centers/template to return the overcloud HEAT template

This is just for the template debugging.
Initial change to compute Heat template to create flavors with UserData script
Added check to Heat script if instance_type does not already exists
Merge pull request #71 from mfojtik/templates

Initial change of the 'compute' Heat template to support creating flavors in Nova
Merge pull request #67 from mtaylor/create_stack

Create stack