Bugs fixing, more tests and linking issues to issues details
* New test to check app behaviour when issue has no comments
* In issues/comments view now is possible to show new issues/comments by ajax when no previous issues/comments existed.
* Hide no issues/comments message when a new issue/comment is created
* There is a link next to each issue to redirect to issue´s comment page
* There is a link in comments page to go to issues list
* An issue is visible only to the users related to it (opener or receiver)