Initial groundwork for Keybase Gem

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- [x] Wrap Faraday as a request object base class
- [x] Make a basic user data object
- [x] Implement a simple user lookup function
- [x] Handle Keybase API errors accordingly
- [x] Basic integration tests
- [x] Travis CI
- [x] Parse all user data into User object
- [x] Implement 2-stage login via getsalt and scrypt
- [x] Find a clean way to share the CSRF token across calls
- [x] Implement key add/revoke
- [x] Implement post_auth
- [x] Implement dump all/latest
- [x] Finish Unit tests
- [x] Integration tests for keys
- [x] Integration tests for dumps
- [x] YARD doc