Story and Task Level Comments with attachments feature.

Hi All , 
I have implemented some new features (story/task-commenting system and attachment uploading) to agilefant.
Details are specified in the README.txt.

I didn't do anything in the existing MVC structure of agilefant. 
I have accomplish the task with some changes in JavaScript, JSP and Java. 

Please correct me if anything is wrong or incorrect in the coding, also put your thoughts on the changes.

![AddingCommentWithAttachments](https://f.cloud.github.com/assets/792538/216016/92cd2ba0-84b1-11e2-85c0-3daccf17745a.png)
![AttachmentConfigurationInSettingPanel](https://f.cloud.github.com/assets/792538/216017/92d1cb2e-84b1-11e2-9664-435c62c17412.png)
![CommentAddedWithAttachments](https://f.cloud.github.com/assets/792538/216018/92cf64b0-84b1-11e2-87d1-8860c0942e85.png)
![CommentsWithAttachmentTextAreaHidden](https://f.cloud.github.com/assets/792538/216019/92d6d7ea-84b1-11e2-8976-f127fdeda7f9.png)
![CommentWindowWithTextAreaOpen](https://f.cloud.github.com/assets/792538/216020/92d7fa4e-84b1-11e2-99fd-e489b073081d.png)