Fix NewDevice select unexcpeted device

Set default conn type to USB

Use usb device default

feat: init device with optional serial, port, mjpeg port (electricbub…

…ble#14)

* feat: init device with optional serial, port, mjpeg port

* fix: solve some feedbacks

Merge pull request electricbubble#13 from debugtalk/master

add a helper function to get initialized giDevice.Device from gwda.Device

feat: new function `Close` used to close inner connections properly

fix: avoid panic

feat: support to provide a scope for the XML page source

> appium/WebDriverAgent#544

fix: avoid request timeout

fix: add perform lock ( only `USB` mode )