Fixed issue #771, allowed new lines in comments

New lines are retained now.
For the two other points which you had asked plz see my comments:
1>In addition, we'll have to address the fact that while adding a comment allows enter to insert newlines, 
::This I had already fixed while providing ctrl+enter to post the comment.

2>editing an old comment submits the changes on enter. We should probably allow shift-enter or alt-enter to insert a newline on editing, or even make the behavior consistent between add and edit.
::As Amol is working on the issue #742 for edit and delete of comments, once that change is incorporated I can take care of this.