Additional CSS cleanup, changed btn-default to use white BG

1. Additional CSS cleanup.
2. Changed btn-default to use white BG so it shows up properly on pages where the background is #efefef. This now also matches the 'Import Contract' and 'Fixed Price' buttons at the top of the 'Add Contract' modal window.
![canceldefault](https://cloud.githubusercontent.com/assets/4713204/4973603/9d6039e6-68bb-11e4-911f-e408df47a66a.png)
![cancelhover](https://cloud.githubusercontent.com/assets/4713204/4973608/9fb9469c-68bb-11e4-991d-11c6bd1377f6.png)
![savebutton](https://cloud.githubusercontent.com/assets/4713204/4973667/109e008c-68bc-11e4-88e7-6f35b1f97c2f.png)


what happened to these styles? they were removed but no class was in place. Unnecessary?
made sure this didn't have any weird effects on IE? won't the button container be too close to the div up top?