Expunge user:pass@... from Host header.

In verbose mode, the basic auth user and password would show up in colored
output reporting the Host header, as reported in
https://github.com/jkbr/httpie/issues/169
fix typo
Merge pull request #192 from thomasleveil/patch-1

fix typo
Merge pull request #191 from solidsnack/wip-no-auth-in-host-header

Expunge user:pass@... from Host header.