View-Only Proposal for when CFP period expires

Hi Chris!

I noticed on TrueNorthPHP site that I couldn't edit my CFP after the CFP period is over - this makes perfect sense. However I wanted to **view** it to help with another CFP I'm submitting to SunshinePHP.

I've created a PR which redirects users to a View-Only page of their RFP when they attempt to edit a proposal after the RFP period is over. This read-only proposal is locked down only for the current user, just like editing a proposal.

* New "view" talk template
* New controller action
* New route for viewing talks (only for current user) in Bootstrap file
* No additional tests, repeating current functionality (and mostly "just controller code")

Let me know of any feedback or additional work I can put into this.

Here's what it looks like:
![image](https://cloud.githubusercontent.com/assets/467411/4112229/6c65a7a8-3220-11e4-90c7-ac7962fcf9b2.png)