Added
- Added `UrlParser` and `Url`
- Added `UrlParser.parse_host()`
- Added `UrlParser.parse_ipv4_host()`
- Added `Url.origin`
- Added `Url.authority`
- Added `urlparse` and `urljoin` to be compatible with
[`urllib3.parse.urlparse`](https://docs.python.org/3/library/urllib.parse.htmlurllib.parse.urlparse)
and [`urllib.parse.urljoin`](https://docs.python.org/3/library/urllib.parse.htmlurllib.parse.urljoin)
- Added support for Python 2.7, 3.4, and 3.5