NPM Build Assumes `window.THREE` Exists

[msimpson]

While this library has module loader support by way of:

// Module loader support:
if ( typeof define === 'function' && define.amd ) {
    define( 'spe', SPE );
}
else if ( typeof exports !== 'undefined' && typeof module !== 'undefined' ) {
    module.exports = SPE;
}

Using module.exports to expose the SPE object is not sufficient without also requiring THREE as a dependency. Therefore, this library--always--needs to be shimmed to even function when loaded via NPM.

[squarefeet]

Thanks, I'm on it (finally).