Python-engineio-v3

- various minor improvements for asyncio support ([commit](https://github.com/miguelgrinberg/python-engineio/commit/24131a90d0ca5bfdafec0e02ee11ec433e81d44a))
- Fixed asyncio example code [35](https://github.com/miguelgrinberg/python-engineio/issues/35) ([commit](https://github.com/miguelgrinberg/python-engineio/commit/f86847beaff82054f677a4e18c08fb5056b61a78))

- minor documentation updates ([commit](https://github.com/miguelgrinberg/python-engineio/commit/af2834dd7fb75c579b8e00d155649ce7c71528a1))
- async socket unit tests ([commit](https://github.com/miguelgrinberg/python-engineio/commit/c19c4477377fe0126a6dda8937414f669dc137f9))
- more asyncio unit tests ([commit](https://github.com/miguelgrinberg/python-engineio/commit/039eb59b021ae59347be6a5614709756b915a5d0))
- catch cancelled tasks due to client leaving ([commit](https://github.com/miguelgrinberg/python-engineio/commit/3abadf1962ef433eb62c83d43522a8d636738fde))
- some initial async server unit tests ([commit](https://github.com/miguelgrinberg/python-engineio/commit/5796794ef2d12823f7306d3cf890fac1290da798))
- asyncio documentation ([commit](https://github.com/miguelgrinberg/python-engineio/commit/d1789caa27e509dcdc0cf76c665f5adab4ad1e41))
- reorganized examples ([commit](https://github.com/miguelgrinberg/python-engineio/commit/824cdd541103f2d52e68848c8cacb2dc4df23c11))
- Preliminary asyncio support! Yay! ([commit](https://github.com/miguelgrinberg/python-engineio/commit/cbeb025e808e9935fb979a042f5884c9ab1a4241))

- Clean websocket exit for uWSGI [377](https://github.com/miguelgrinberg/Flask-SocketIO/issues/377) ([commit](https://github.com/miguelgrinberg/python-engineio/commit/d15842383b1cd0fbaa741c5125b5ef26d1915a7a))

- Use text/plain content type for base64 encoded responses [33](https://github.com/miguelgrinberg/python-engineio/issues/33) ([commit](https://github.com/miguelgrinberg/python-engineio/commit/297ff98e0d9f8f3b32ca5d2afe566a80bb16c6d8))
- removed py33 from tests, added py36 ([commit](https://github.com/miguelgrinberg/python-engineio/commit/e0541bcfa069df0f54195a9031630baf7a46c069))
- additional fix regarding bytearray support ([commit](https://github.com/miguelgrinberg/python-engineio/commit/268e3cba424391dd32950d0ba08d28a65c4ef14b))
- Merge branch 'wwqgtxx-patch-1' ([commit](https://github.com/miguelgrinberg/python-engineio/commit/4f25274a0e2e66b2a867b1cdcdf1e820c487e630))
- allow binary packets to be given as bytearrays ([commit](https://github.com/miguelgrinberg/python-engineio/commit/eb8f357082369422464237f47a3c419fb7d14490)) (thanks **wwqgtxx**!)

- Prevent recursive disconnect handlers [329](https://github.com/miguelgrinberg/Flask-SocketIO/issues/329) ([commit](https://github.com/miguelgrinberg/python-engineio/commit/84d5800c027fe093db0d7624cbc1e73e176ec221))

- Use a statically allocated logger by default ([commit](https://github.com/miguelgrinberg/python-engineio/commit/e6b3a6d8bce3d7f53fde7b56037fd9e9f7cbe492))
- fix unit test to work on python 2.7 ([commit](https://github.com/miguelgrinberg/python-engineio/commit/aab2182cea4f4fd3c64b512b443d6f0f3f35a5a9))