Compatibility with leaflet 1.X

[erkinsergey]

The current version is not updated for a long time and is incompatible with current leaflet 1.x.
When using this version of leaflet there are errors and warnings that do not allow working with the plugin.
I was able to start it in the work as follows:
in source file rlayer-src.js find the line

R.Layer = L.Class.extend({
	includes: L.Mixin.Events,

and replace it with

R.Layer = (L.version < "1.0" ? L.Class : L.Layer).extend({
	includes: (L.version < "1.0" ? L.Mixin.Events : []),

After that the plugin worked without problems.