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.
If you press ctrl+enter it will go away. If you press enter it will go to next line. Shouldn't this be the expected behaviour. I just tested its not sticking around.
Regarding width as its a DIV if I don't specify then a long line(vertical) as cursor appears when you select and enter the comment for editing. 
![7662](https://cloud.githubusercontent.com/assets/391355/3729408/3cb18b86-16bd-11e4-8e06-f365e0b0f527.png)
The reason is min width is 0 so it will be very confusing for users to see whats happening. I thought its better to show him like text area so he can understand and enter comment.
I can give min width as 10% or 5 % also but was looking odd to me as the text area was big.
So made it 95% so that the close ikon is also there at the right.
![7663](https://cloud.githubusercontent.com/assets/391355/3729446/d63fbda4-16bd-11e4-9032-22d95f08b823.png)
Please advice how you want it.