bumps mapbox-upload
preview user's fonts
simplify font image creation
refactor where font path comes from
update empty state
fix mistake
improve empty state text
Merge branch 'bump-upload' into userfontui
fix tests
up tilelive version
bump tilelive bridge
update fixture
add backend tests for fonts
frontend tests for fonts
Update all deps for mapnik 3.1.x.
Use tm.join() to robustify path joining.
Add test for font preview rendering with fontdir specified.
Not a cache hit.
Slight code style.
Merge pull request #1001 from mapbox/userfontui

UI for user fonts