Merge pull request binance-exchange#226 from jaggedsoft/master

Merge from Development

Now supporting Promises, Futures, Margin, and OCO

Merge from development

Adjustable limit for chart function

Add assetDetail and tradeFee functions

Add assetDetail and tradeFee functions
```js
const Binance = require('node-binance-api');
const binance = new Binance().options("options.json");
binance.useServerTime( () => {
	binance.assetDetail((error, response) => {
		console.log(response);
	});

	binance.tradeFee((error, response) => {
		console.log(response);
	}, "BNBBTC");
});
```

Several improvements from bmino and dmzoneill

Expose order() function to public API (Thanks ManuCart)

Expose order() function to public API (Thanks ManuCart)