Update team-data.json

I found the PNG files on Wikipedia.
![indians_logo_2014_season](https://cloud.githubusercontent.com/assets/6335230/3073443/744164ea-e2ec-11e3-935e-db58015f3f25.png)
![orioles_new](https://cloud.githubusercontent.com/assets/6335230/3073447/83a6722c-e2ec-11e3-9f9b-905f4e5c62ac.PNG)
![pirates_logo_2014_season](https://cloud.githubusercontent.com/assets/6335230/3073449/8d177482-e2ec-11e3-8ac5-e360517fd411.png)
![charlotte-hornets_new_logo](https://cloud.githubusercontent.com/assets/6335230/3073450/92d99d00-e2ec-11e3-9147-f03f49980e77.png)