Remove commented code

We don't impose filters when finding a tree under a map click, on
the assumption that the canopy and filter layer are always displayed
Scale and crop the tree thumbnails for popup

This is an imrprovement in so much as the pictures do not stretch
the parent popup view when they are in different orientations, but
could still use some styling work with padding and so forth.  Waiting
for a style overhaul before actually touching xml layouts too much.
Merge pull request #52 from OpenTreeMap/fix/47/photo-crop

Scale and crop the tree thumbnails for popup