[WIP] Adding RDP Compression

[mkellogg91]

This adds RDP Compression via the Simplify.js npm package found here:
https://github.com/mourner/simplify-js

and can be used like this:

var container = document.getElementById('plot');
        var plot = new sigplot.Plot(container, {
            xcmp: 6
        });

Use of this compression is also implemented in the first test to run within the tests directory