Update (hipchat) path for new HipChat branding

HipChat just updated their branding, including the (hipchat) emoticon.

Before:
![screen shot 2014-05-07 at 8 36 42 am](https://cloud.githubusercontent.com/assets/831600/2902382/4f70baea-d5e4-11e3-9bdf-d171c3eecbee.png)

After:
![screen shot 2014-05-07 at 8 36 30 am](https://cloud.githubusercontent.com/assets/831600/2902385/55734688-d5e4-11e3-9c69-2c279abb90a3.png)