spiff prereq not mentioned

[parente]

The generate_deployment_manifest script in step #7 of the README requires spiff. A link to the project and/or note on how to install it would save a bit of searching.

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this. You can view the current status of your issue at: https://www.pivotaltracker.com/story/show/75778266.

[maxbrunsfeld]

@parente, thanks for pointing that out. We've added a note about spiff in the README.