M-x package-install pivotal-tracker
Pivotal Tracker Mode provides a mode and functions for interacting
with Pivotal Tracker through its API.
It is designed to give most of the functionality that is important to a developer.
Before using the tracker you must customize your pivotal API key.
You can obtain the key from the 'My Profile' link in the Pivotal Tracker
M-x customize-group RET pivotal RET