Add 5 company logos

Thanks for sending your logos...
@sroussey (Weebly)
@alxndr (Bleacher Report)
@adamdill (Inside)
@brentmulligan (Merchbro)
@reustmd (Betterment - logo sent by Joe Ziemer)

![logos](https://cloud.githubusercontent.com/assets/1666031/5592125/85b6f46e-9184-11e4-8f21-078d59572faa.png)
![logos2](https://cloud.githubusercontent.com/assets/1666031/5592127/8a8f70a6-9184-11e4-9c8d-4695c6be9ac9.png)