Add Console section to README.md

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Update relex and mix.exs usage

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Bump version 0.1.0

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Update TODO list on README.md

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Update to Elixir v0.13.1

* Update JSEX (decode to maps)
* Use Dict instead of ListDict
* Use maps instead of list dicts
Update README.md

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Use signaturex to validate requests
Use 600 seconds as timestamp grace

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Update README.md

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Add last release version badge

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Add support to 0.13.2
Update signaturex

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Update comprehensions to for comp.
Deploy to Heroku

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