Add support for dynamic key detection during decryption #7
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This change adds 2 related things:
Allows arbitrary headers to be added during encryption. This allows any variety of things, including (but not limited to) any of the various key-identifying headers defined in the JWE spec.
Allows a block to be given to dynamically determine what key to use during decryption. The block is given the headers, allowing use of whatever key-identifying header may have been set during encryption. The implementation of this is very similar to dynamic key detection in ruby-jwt, making it easy to use both.
An example has been added to the README which should explain how to use both together.