extend CommonRequest for GsonRequest

src/main/java/com/imyeyu/network/CommonRequest.java

@@ -32,6 +32,10 @@ public class CommonRequest {
 		return request.execute().returnContent().asString();
 	}
 
+	public Number asNumber() throws IOException {
+		return Double.parseDouble(asString());
+	}
+
 	public byte[] asBytes() throws IOException {
 		return request.execute().returnContent().asBytes();
 	}