Update BinanceAPI Constructor and add API calls

[hotsaucejake]

Setup the __construct() so that you can call BinanceAPI outside of the alias/facade. Similar to what you have setup on your laravel-bittrex package

function __construct(array $auth = null, array $urls = null, array $settings = null)
    {
        if(!$auth)      $auth       = config("binance.auth");
        if(!$urls)      $urls       = config("binance.urls");
        if(!$settings)  $settings   = config("binance.settings");

        $this->key    = array_get($auth, 'key');
        $this->secret = array_get($auth, 'secret');

        $this->url        = array_get($urls, 'api');
        $this->wapi_url   = array_get($urls, 'wapi');

        $this->recvWindow = array_get($settings, 'timing');
        $this->curl       = curl_init();

        $curl_options     = [
            CURLOPT_SSL_VERIFYPEER => array_get($settings, 'ssl'),
            CURLOPT_SSL_VERIFYHOST => 2,
            CURLOPT_USERAGENT      => 'Binance PHP API Agent',
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_CONNECTTIMEOUT => 20,
            CURLOPT_TIMEOUT => 300
        ];

        curl_setopt_array($this->curl, $curl_options);

    }

I added more public API calls based on these docs: https://github.com/binance-exchange/binance-official-api-docs/blob/master/rest-api.md

Interestingly enough, v1/ticker/allPrices isn't mentioned ANYWHERE but it is a valid call with your getTickers() method.

New methods include:

• getServerTime
• getExchangeInfo
• getOrderBook
• getPublicTrades
• getAggTrades
• getCandlesticks
• getAvgPrice
• getTickerChange
• getTickerPrice
• getBookTicker

I removed getTicker() because it returned the exact same information as getTickers(). I also removed getCurrencies() because there was no need for it.

[adman9000]

Only issue with removing functions is I'm trying to be consistent with the other exchange APIs as I have a 'cryptoexchange' wrapper package which utilises the bittrex, binance, cryptopia & kraken API packages I've written. The aim was to provide consistent functions & return values to make it easy to switch between exchanges within the code.

[hotsaucejake]

Hmm... I'll update it with the removed methods for backwards compatibility. Probably won't be able to get to it until tomorrow though.