Changed URL for "Report A Bug" so that it can directly take user to reporting page.

Fix for MAGN-5130 (http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-5130)

Earlier URL for "Report A Bug" or "Send Issue" on start page was taking user to list of issues page rather than opening a new issue page on git hub.

*Note:* If user is not signed in to Github then this new URL will take him to Sign In Page, if he has already signed in then it will open New Issue page.

<h4>Reviewer</h4>
- [ ] @sharadkjaiswal 

<h4>Need Merge to Revit 2015</h4>
- [ ] Merge to Revit2015

![image](https://cloud.githubusercontent.com/assets/5109531/4713694/ac31bb88-58e5-11e4-8808-ed881e0f5ad6.png)