[proxying] Fix DELETE methods
Add custom serializer for better handling of constraints
Merge pull request #74 from mesosphere/constraints-proto

Add custom serializer for better handling of constraints
Merge pull request #73 from airbnb/master

[proxying] Fix DELETE methods

Merging this for now, but it would be great to do this based on whether a body is present
Added new task search, scale endpoints.

Now you can scale apps by killing individual tasks.  You can use the
'/v1/apps/$appId/tasks' to list tasks for an app, and then scale
apps by killing individual tasks with a POST to
'/v1/tasks/kill?scale=true&appId=id&host=host&id=taskid'.