fix parallel line detection bug
better parallel line handling
more miter debug info
bringing in some polyline improvements from master
move geometry builders back to GLRenderer namespace, remove from core GLRenderer class definition
move web worker callback to its own function on GLRenderer, using Function.bind() for the callback
move base tile url def
move base tile url def
extract some tile processing to separate functions and generalize timers
add some more tile processing metrics
Merge branch 'master' into workers
fix tile debug
move mercator projection to web worker