Displays clickable list of issues that each open in new page. Test passes.

@oliverbarnes : Issue titles are displayed in /issues in a list. The titles are hyperlinked to the individual issue page (e.g. /issues/1) which displays the title and description of the issue.

Do you want this, or do you want the issue to open up under the title as an expandable text when the user clicks on the title?
Could be simplified to 

```
li.issue
  a click="toggleExpand" #{title}
  if isExpanded
    p.description #{description} 
```