Adjusted styles for sidebar featured team and created partial for markup separation.

Markup and css has been adjusted to account for Featured Teams that have uploaded custom images to their Team profile:

Previous:
This is what the widget looked like previously.  Notice the avatar had negative margin which made it overlap the custom image.
![current](https://cloud.githubusercontent.com/assets/197892/3462624/7110f972-022f-11e4-87d0-11dd0ef24b44.png)



Updated:
This is what a featured team looks like with custom uploaded image:
![custom-image](https://cloud.githubusercontent.com/assets/197892/3462538/80c90f4a-022e-11e4-8547-c662ee3bcfc8.png)


No custom image:
This is what a featured team looks like without custom uploaded image:
![default-image](https://cloud.githubusercontent.com/assets/197892/3462530/677a3852-022e-11e4-9780-e4cd85a1aa13.png)