Added creation of a from-header if not specified
Follow-up on review
(Issue 777) Switch to using email has as id seed
Improve  docs for hash identity
Merge pull request #866 from mrvisser/email-spam

(Issue 777) Improve email spam score
Updated README to recommend nodejs 0.10.x
Update README.md
Always return defaultValue in config schema even when it's not provided in the config file
Follow up on providing fallback defaultValue