fixed zip.workersScriptPath. Now set correctly.
initial stab at parsing blob's upfront
cleanup old code
removed throttler and more cleanup
removed unused _timerStarted
add code comments to _parseInMemTiles
removed old test array
separated out parsing functionality into extend()
minor cleanup
fixed bugs in autoCenterMap.js
re-allowed autoCenter
tweaked how progressEvent is used
redid use of progressEvent in index.html