course dashboard course element visual styling changes

Changes:
1.) More courses shown due to less height/padding around each course item
2.) Messages for verified certificates, certificate scoring, final grade plus certificate download, all moved below the course actions and settings (email  + unregister) 
3.) reduced use of absolute positioning and floats, some small other css standards adjustments, but all minor changes. 


Current: 
![image](https://cloud.githubusercontent.com/assets/2023680/3698042/1528aaee-13b7-11e4-80da-ae8fc5642bd5.png)
New: 
![image](https://cloud.githubusercontent.com/assets/2023680/3698037/04d7c27e-13b7-11e4-9c96-fdca5bf59edc.png)