Added teamcity widget to radiator

Adds the standard Teamcity build widget. I went with the widget instead of the API to avoid needing to configure and expose usernames and passwords.

~~I have just tweaked its style a bit mainly by hiding things.~~

~~The icon is a bit low res, might look into replacing it.~~

~~Screenshot will follow~~

![teamcity](https://cloud.githubusercontent.com/assets/76709/4177781/ee7d321e-365e-11e4-9d7c-eb19cdd976af.png)