Update sendMention() to honour redirects as specified by [Webmention Rocks Discovery Test 23](https://webmention.rocks/test/23)
0.5
Fixes - Issue 17 move lxml to extras_require - Issue 16 support for custom timeout - Issue 15 support for custom User-Agent string
0.4
- add new webmention.rocks based tests and helper tool - fixed issue with parsing of link rel's because of quotes - added Python v3 support, thanks sknebel for the PR