Pivotal tracker

I've created a Tracker status checker which might be useful for others.

I based the output on the information I want to know at any point, most importantly have I got any rejected stories to worry about.

* **Green:** You don't own any rejected stories
* **Red:** You own a rejected story
* **Pending:** You haven't started a story

The configuration syntax isn't beautiful, Tracker's API uses the full user's name to relate a story to an owner. I made the name the last parameter so that I can splat it in.

```
my_tracker_project: tracker.check project_id api_key My Full Name
```

I used the Pivotal Tracker gem so that I could get this out in a couple of weekend hours, it could be removed if it's felt the external gem dependencies is an issue.