Modified the issue controller to support addition of comments with attachments
Modified the upload widget to support a full reset when needed
Modified the comment validator to validate the CommentDTO instead of the Comment Entity
Modified the file upload service to provide the get attachments by their ids functionality
Modified the Comment entity to now contain attachments
Created the comment DTO to be used when creating a comment
Conflict merge
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/main/java/internship/issuetracker/controller/IssueController.java