Cc12703-uiautomator2

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* fix app\_start without activity not launch error
* add adcd.py(abstract class about device) and implement pure adb to run test
* implement pure adb to run test
* use Baidu OCR to select element (419)

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* update androidbinary to fix momo can not start error 393
* add support u2.connect\_usb(serial, init=False)
* change function behavior d.touch.up() to d.touch.up(x, y)

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* fix app\_list\_running() only show 3rd party apps bug, add support to read from env-var ANDROID\_SERIAL

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* fix and add doc for app\_start 425, add uiautomator check in dump\_hierarchy
* add thread lock in dump\_hierarchy
* fix session restart
* Update README.md
* add notification about dingtalk travis

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* add wait gone
* add strict argument to session()
* rename UIAutomatorServer to Device, add session.restart() method
* change http://tool.appetizer.io to https protocol
* add swipe\_ext('right', 0.9) method
* add app\_wait, app\_list\_running

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* add swipe and screenshot to d.xpath element
* fix init with serial
* update changelog, remove d.watchers.watched, use IPython.embed first in cmd:uiautomator2 console
* add console in command line
* fix shell(stream=True) timeout error, close 394