Add batch API endpoints for Add, Update, and Delete interactions

As a heavy user of the REST APIs to aggregate and disseminate information across multiple systems, I would like to have a batch API endpoint for updating Features in order to avoid Throttling limitations in the existing one-update-at-a-time REST in API v1.

Background:

Like many organizations, there are many tools that my team interacts with on a regular basis.  From these tools we aggregate and analyze information.  Post analysis, we want to return a sub-set of the analysis back to the core systems where people are working.  The availability of API endpoints makes this possible.  Instead of asking for cycle time Monte Carlo simulattors, I can do that myself and post the results.  Unfortunately, with a moderate number of teams and cards in Aha, I am hitting throttling limits.  The solution is a batch update process.  This will make my code and the Aha endpoints more efficient.