* Run on msys/cygwin, anyway
* Raise error correctly when connection failed (PR91)
* Change browser download location and temporary user data directory to:
* If `$PYPPETEER_HOME` environment variable is defined, use this location
* Otherwise, use platform dependent locations, based on [appdirs](https://pypi.org/project/appdirs/):
* `'C:\Users\<username>\AppData\Local\pyppeteer'` (Windows)
* `'/Users/<username>/Library/Application Support/pyppeteer'` (OS X)
* `'/home/<username>/.local/share/pyppeteer'` (Linux)
* or in `'$XDG_DATA_HOME/pyppeteer'` if `$XDG_DATA_HOME` is defined
* Introduce `$PYPPETEER_CHROMIUM_REVISION`
* Introduce `$PYPPETEER_HOME`
* Add `logLevel` option to `launch` and `connect` functions
* Add page `close` event
* Add `ElementHandle.boxModel` method
* Add an option to disable timeout for `waitFor` functions