Make "s" in "https" optional to match URL w/ regex

Some folks may be using a GitHub Enterprise server that doesn't support
HTTPS.
Fix typo: initializaiton => initialization
Merge pull request #300 from msabramo/fix_typo

Fix typo: initializaiton => initialization
Merge pull request #299 from msabramo/make_https_optional_for_url_regex_matches

Make "s" in "https" optional to match URL w/ regex
Skip objects iterated over that are None

Fixes #304
Fixes #305