Prepare for webpack etc

[homerjam]

Hi,

This patch prepares the module for webpack etc. It follows the best practices/same patterns that you find elsewhere, it allows you to do the following:

angular.module('myApp', [
    require('angular-google-maps-native'),
]);

Thanks

James

[grawk]

:+1: for this PR

[cburza]

Awesome. Thank you for the PR.