TorqueSpec can now execute multiple specs within a single deployment via the default_deploy configuration option

The new configuration option called default_deploy specifies a filename where TorqueSpec should look for a default deployment descriptor. If the file exists then this default deployment descriptor is used for all specs except for those which explicitly define a deploy statement within their describe block. Specs which default to using the default_deploy descriptor will not need to undeploy and redeploy before they run. The default_deploy configuration option defaults to "default_deploy.yml".