Leaflet Velocity Versions Save

Minor security patches, adds support for arbitrary direction/speed labels.

Minor security patches.

Added scanMode 64 and some data header checking, as noted in #46 . Thanks to @brentfraser.

Addresses an opacity issue where value of 0 did not completely hide layer.

Added opacity as a layer option, e.g. can be set like:

myLayer.setOptions({ opacity: 0.5 });

Use Leaflet map projections so any coordinate system can be used (rather than previously hardcoded mercator). Thanks to @brentfraser

• added setOptions public method
• added support for custom panes if using leaflet v1+
• upgraded build to gulp v4