Show delete room button only if room belongs to current logged in user.
Fix some styling, layout and CSS bugs.
Merge pull request #15 from paulld/add_list_or_users

Show delete room button only if room belongs to current logged in user.
Add error when no users added to chatroom.
Merge pull request #16 from paulld/some_styling

Fix CSS & Markup. (+ previous pull request: show delete room button only if user is owner)