It's based on GMaps.js v0.2.1
Although GMaps.js does not support requirejs right now, just folk and do some modify to fit my requirement.
Reference the discuession at here, and change to requirejs module based on Felipe Leusin commit
If you want to use it, just pick a gmaps-amd.js, make sure you have jquery & async in you requrejs settings, then just use gmaps module, that's it!