Merge pull request #80 from ramiel/proxy_support

Added proxy support

src/Httpful/Request.php

@@ -409,6 +409,31 @@ public function withStrictSSL()
     {
         return $this->strictSSL(true);
     }
+
+	/**
+	 * Use proxy configuration
+	 * @return Request this
+	 * @param string $proxy_host Hostname or address of the proxy
+	 * @param number $proxy_port Port of the proxy. Default 80
+	 * @param string $auth_type Authentication type or null. Accepted values are CURLAUTH_BASIC, CURLAUTH_NTLM. Default null, no authentication
+	 * @param string $auth_username Authentication username. Default null
+	 * @param string $auth_password Authentication password. Default null
+	 */
+	public function useProxy($proxy_host, $proxy_port = 80, $auth_type = null, $auth_username = null, $auth_password = null){
+		$this->addOnCurlOption(CURLOPT_PROXY, "{$proxy_host}:{$proxy_port}");
+		if(in_array($auth_type, array(CURLAUTH_BASIC,CURLAUTH_NTLM)) ){
+			$this->addOnCurlOption(CURLOPT_PROXYAUTH, $auth_type)
+				->addOnCurlOption(CURLOPT_PROXYUSERPWD, "{$auth_username}:{$auth_password}");
+		}
+		return $this;
+	}
+
+	/**
+     * @return is this request setup for using proxy?
+     */
+	public function hasProxy(){
+		return is_string($this->additional_curl_opts[CURLOPT_PROXY]);
+	}
 
     /**
      * Determine how/if we use the built in serialization by