Nonocaptcha-fork

* requirements.txt
* Update to include Pyppeteer v0.0.21 (Whoops)

* Move exceptions to a separate module - exceptions.py
* solver.py
* Place some long running coroutines into AbastractEventLoop.create_task
* No longer handling BaseExceptions on initial solve method
* launcher.py
* Add modifications for Pyppeteer v0.0.21
* proxy.py
* Replace asyncio.Lock with threading.Lock
* examples/
* aiohttp_executor.py
* Polished multithreading, ensuring browser exits (hopefully)
* Once again might have forgot something...

* solver.py
* Add function cleanup() to solver for closing browsers
* Bypass Content-Security-Policy in response headers
* launcher.py
* Remove signal handlers in launcher due to redundancy
* proxy.py
* Remove last_used_timeout argument
* examples/
* Change naming of files
* api.py
* Add multi-threaded support
* Fix bugs
* I might have forgot a change...

* Add compatiblity for Python versions 3.6.0 - 3.7.0

* Fix bug

* Move configuration checking out of __init__.py into base.py