Remove param explode_nested from doc

Remove param explode_nested from method resource_to_template document
since it does not exist in parameters.

Change-Id: I0ef14319bf6e39bb59a3d1753fc57bdb7698fe38
Use all available headroom for autoscaling

Fixes bug 1254796

Previously, potential headroom for autoscaling group growth
or shrinkage would remain unused unless the adjustment exactly
hit the max or min size respectively.

Now, we truncate the adjustment to the upper or lower bound
in the case of an over-shoot.

Change-Id: I760be999039f7038dab77cb8b77a0f683ef56db3
Merge "Remove param explode_nested from doc"
Merge "Use all available headroom for autoscaling"
Merge "Add filter support to stack API"
Add API endpoint to query build information

This creates the '/<tenant_id>/build_info' endpoint and returns the build revision
as defined in the 'heat_revision' configuration option. This provides
both the revision of the engine and the api:

{
  "api": {
    "revision": <api revision>
  },
  "engine": {
    "revision": <engine revision>
  }
}

Implements: blueprint heat-build-info
Change-Id: Ibb2f5afda7c5d7c314e5e062d618405d9f4eb318