first stab at #500
fix dimensions by scale
fix se corner
fix dragging error
do not let empty bounds get passed to locationfilter
better error handling for resizing dim
begin adding print ui test fixtures re: #569
more tests
syntax bugs
Merge branch 'master' of github.com:mapbox/tm2 into mercator-adjust

Conflicts:
	test/test-client.js
Merge pull request #572 from mapbox/mercator-adjust

Print UI Improvements