Allow 'prequest' to send basic auth headers.

Also, allow passing PROPFIND / OPTIONS as methods.
Typo firx from merwok.
Get this out of the way after removing the pre-commit hook.
Coverage for new '--login' option.
Coverage for new OPTIONS and PROPFIND methods.
Merge branch 'master' of github.com:Pylons/pyramid
add an entry to changes about code merged from feature.prequest_login branch
Merge branch 'feature.prequest_login'