Show the unique species and dbhs in popup

Previously we were showing the whole grid... but that got messy quite
quickly. The new approach is to just show to lists: "Species" and
"Classes" that are in this polygon and let the user click through for more.
Merge pull request #133 from ahinz/bug/update-popup-text

Show the unique species and dbhs in popup
Open polygon view/edit link in a new tab