Add specific performance contact

*Instead of allowing users to choose the role on the contract, pass this in based on the link they click on.
*This is better because each of the 4 roles (2 customer, and 2 contact) need to be present on the performance and no role can be duplicated.
*Cleaned up the views to only present the customer partial if they click on one of the customer links, and likewise for partner links.
It's a little hard to read through these lines in this file due to line-length and the information you're passing in. That may just be from the naming convention, but as an outsider looking in, I'm slightly confused. 
There is also some repetition which you can define as a helper method.

Lastly should this file be an ```html.erb``` file instead of just ```.erb```?