Merge #22

22: Release a new version r=Eijebong

Changelog:

* Resolve relative URLs with a given base (off by default, you need to specify that base URL)
* Add `rel="noreferrer noopener"` to links, as a security measure
* Avoid closing void tags, such as turning `<br>` into `<br></br>`
* Bump the html5ever version
* Switch to using docs.rs to host docs

Merge #14

14: Bump html5ever to 0.18 and bump version r=notriddle

This updates serde from 0.9 to 1.0

Stop Travis from screeching about staging.tmp

Bump version to 0.3.0

Merge #8

8: Update to 0.2 r=notriddle