Pyee

- Fixes/Updates to pyee docs
- Uses vcversioner for managing version information

- Errors resulting from async functions are now proxied to the "error"
event, rather than being lost into the aether.

- Fix setup.py broken in python 2.7
- Add link to CHANGELOG in README

- Fix RST render warnings in README

- Add README contents as long\_description inside setup.py

- Drop support for pythons 3.2, 3.3 and 3.4 (support 2.7 and 3.5)
- Use pytest instead of nose
- Removed Event\_emitter alias
- Code passes flake8
- Use setuptools (no support for users without setuptools)
- Reogranized docs, hosted on readthedocs.org
- Support for scheduling coroutine functions passed to `ee.on`