ability to send file via sendMessage

lib/Client/Client.js

@@ -251,6 +251,11 @@ var Client = (function (_EventEmitter) {
 			callback = options;
 			options = {};
 		}
+		if (typeof content === "object" && content.file) {
+			// content has file
+			options = content;
+			content = "";
+		}
 
 		return this.internal.sendMessage(destination, content, options).then(dataCallback(callback), errorCallback(callback));
 	};