For the popular issue #75 (release note generation under the Version's page)

This is a first check-in take a look at the patch, it's a full new functionality and also provide me code feedback. 

We need to discuss about finalizing the stuff. 

Here are todo/open discussion:
1. debate/finalize the look and feel and details on dashboard. 
2. Release note dashboard should come up only if the Release note module is enabled for the project. 
3. Should the Release note tab disappear now? 
4. I would like that the entire dashboard div should be able to hid/show with click on the title of it. (is this a good idea?) 
5. Should the 'Generation can also be below the same div'?
6. Need to add locales other than en. 
7. Any re-factor as needed.

Any feedback would be welcome.