Syntax Correction, New History Service API, Formatting, History Example

Hi @evalcrux,
We are going to use your API on Wagaduu!.
The most important change was a ";" in the middle of a line that crash the app.
After that, we added the History call.
At the end, the example and the Formatting (automatic via IntelliJ).

Didn't change the package.json with a new version because you are the owner.

If you could push it asap, we are using a local modification copy until that.

Regards!
Seba - Wagaduu!
@sebabromberg