Merge pull request #4 from Alkorin/assertionCheckSignature

Security Issue: signature is not checked

Split out HTTP handlers

This can be useful when nesting the assertion or attestaion responses
inside another object which can contain other data, such as the name
of the authenticator.

Move up removing the Debug from the error to before the JSON serializ…

…ation

Fix checking of curve for fido-u2f format, makes Yubikey 4 work

Add support for the packed format as used by the Yubico Security Key

Return Authenticator from FinishRegistration

Change case of JS file