user expects to see evidence history date

Change Description - :smile:
------------------

### What does this change do?
This enhancement adds evidence/revision history dates to an accordion collapse on /requirements and proofs#edit

![screenshot 2014-04-15 21 41 25](https://cloud.githubusercontent.com/assets/331004/2715295/d421c82a-c508-11e3-9f06-afb197789bc4.png)

![screenshot 2014-04-15 21 40 13](https://cloud.githubusercontent.com/assets/331004/2715297/d9e12a08-c508-11e3-970f-be0662efcd60.png)

### What testing has been done?
Tests have passed and this has been QA'd locally. Code has been reviewed as well. 

Risk Assessment
---------------

### What are the risks? Is there a business impact?
There isn't a risk nor a business impact.