Install Notes
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1. "token" is your Pivotal Tracker API Token. This is at the bottom of your 'My Profile' page.
2. "branch" is the name of the branch you want to listen for commits on. If none is provided it will listen on all branches.
3. "endpoint" is an optional endpoint for a custom Pivotal Tracker installation.  Leave this blank to use "https://www.pivotaltracker.com".
