don't mention issue with Android 2 anymore

- Update Leaflet.ActiveLayers dependency.

- Change project name to npm acceptable.

Update the build process. Nothing changes really.

Fix control collapsing for the desktop webkit browsers.

Replace overlay layers checkboxes with the select multiple tag.

 There was impossible to select a base layer in the Chromium Version …

…25.0.1364.160 Ubuntu 12.04. This patch temporarily disables collapsing of the toggle container on 'mouseout' to prevent this issue.

Bugfix of assignment _activeBaseLayer in _changeBaseLayer.