New delete cookie endpoint.
Updated example linked to include two deletions.
README: add https + show_env example

Showcase a useful but undocumented feature of reporting what protocol
the request was made over (amongst other info).
gah
2.7.3
runtime
newline
test
python-2.7.3
PATCH again!
Merge pull request #63 from snh/cookiedelete

New delete cookie endpoint.
Merge pull request #67 from senko/showenv-doc

README: add https + show_env example