Update Readme to mention animateAddingMarkers doesn't work with addLayers

Thanks @Driklyn
Fix not firing animationEnd when we have only one marker in the markerClusterGroup. Fixes #146
Fix whitespace
Add MarkerCluster.getBounds
Update build
Fix #155, work with uglify-js version 2
Merge pull request #156 from pietervandereems/master

#155
Fix some warnings from new uglify
Update build
Cludge around our hasLayer implementation to make us work with the latest Leaflet master. Fixes #159

Our hasLayer returns true when we contains a marker. FeatureGroup/LayerGroup (which we inherit from) now check hasLayer when addLayer is called. At this stage our hasLayer will return true, stopping the marker from ending up on the map.
Update build
Add a real world example that shows a bug.
Fix IDs in example data.
Make this work on old leaflet too. Thanks @nkovacs
Update build
Merge pull request #162 from skullbooks/master

Add an example that shows some strange error with a disappearing marker.
Move example to old-bugs dir (not that it is fixed yet)
Fix clearLayers with spiderfied markers. Refs #162
Remove hasProperty checks from loops. Refs leaflet/leaflet#1606
Update build