GWT Compatibility

[aitor3ml]

Could you provide compatibility with GWT?
It looks like you already thought on this issue, but it's not finished though.

There are a few calls to unimplemented GWT functions.

Thank you.

[StrongJoshua]

I'm not very familiar with GWT. If you know what needs to be changed, feel free to submit a pull request. If not, but you have the error logs you are currently getting, then please provide them, so when I find time, can go through and try to make the necessary changes.