Avoid normalizing undefined email addresses
Validation errors should return 400 errors, not 500
Merge pull request #68 from fmarier/use_400_error_code

Use 400 error code for missing parameters
Remove redundant info
Document the code layout
Document the API
Document the current blocking and rate-limiting policies
Merge pull request #63 from fmarier/document_all_the_things

Document all the things (fix #61)