v1.0.0 for Leaflet 1.0 + MCG >= 1.0.4

Compatible with Leaflet >= 1.0.0 and Leaflet.markercluster >= 1.0.4

Breaking changes:

• Compatibility with MCG >= 1.0.4; previously non-clustered markers disappear when clusters split #5

Fixes:

• Compatibility with Leaflet.MarkerClusterGroup.LayerSupport sub-plugin #6 and ghybs/Leaflet.MarkerCluster.LayerSupport#13
• Dynamically added marker do not appear if they are out of the initial view port #7

Docs:

• Refactor demo page so that it can load selected versions of Leaflet, MCG and MCG.Freezable, as well as locally built dist version, therefore obsoleting the debug pages.
• Move gh-pages branch to docs/ folder, so that online demo pages are easier to maintain #9
• Use a build script for README, so that versions are automatically updated #8