doc: Mention python dep in downloads page

Closes #3604
blog: v0.11.6
uv: Upgrade v0.10.14
2013.08.21, Version 0.10.17 (Stable)

* uv: Upgrade v0.10.14

* http_parser: Do not accept PUN/GEM methods as PUT/GET (Chris Dickinson)

* tls: fix assertion when ssl is destroyed at read (Fedor Indutny)

* stream: Throw on 'error' if listeners removed (isaacs)

* dgram: fix assertion on bad send() arguments (Ben Noordhuis)

* readline: pause stdin before turning off terminal raw mode (Daniel Chatfield)
Merge branch 'v0.10.17-release' into v0.10
Now working on 0.10.18
blog: Post for v0.10.17
tools: script to report [un]stable build
tools: script release steps after jenkins build