Fixed issue #771.Comment allow new line.

Raising Fresh PR on issue #771 as my previous branch got messed up while pushing from local.
I have tested all scenarios from my end. 
The comment div is taking care of next line.
In case of edit it accepts new line and on hitting enter it goes to next line. to post the changed comments user will follow same ctrl+enter.
what does this do?  why make the text box wider in this case?  

was the border intended for debugging purposes?  it actually sticks around after the comment is committed and then disappears once another comment is added or edited, which is kind of strange.