Add loadedAll and more events
Preserve order of packs, even when loaded asynchronously
Handle errors in loading packs, either fail to retrieve URL or parse zip archive
Create Blob URLs
Add clear()
Add drag and drop handlers for demo
Add overall container to demo
Cancel drag events, fixes drop event handling
Add refresh() to revoke URLs, clear() to delete packs
Allow dropping packs in demo to load
Demo: shift-drop to append pack, instead of replace
Demo dynamic resource lookup
Show loaded packs; cleanup
Add demo instructions
Merge branch 'master' into gh-pages
Update demo: browserify demo.js > bundle.js