Add chunkedLoading option. refs #292
Use chunkedLoading for the 2 big examples
Fix up a performance issue found, when adding markers we were doing a lot of unnecessary checks for duplicate markers.
Remove console.log lines
Update build
instrument time elapsed and report progress
add a simple progress bar to the 50K sample
Revert "instrument time elapsed and report progress"

This reverts commit 8732cb4f0a416c220084912a7a4e0b287532a3e1.
Merge pull request #294 from mindplay-dk/better-loading

Better loading
whitespace
More whitespace fixes :)
Merge branch 'better-loading'

Conflicts:
	dist/leaflet.markercluster.js
Update build