Only generate state when it is not passed as an option to the authori…

…ze function

Fitbit is OAuth 1 :-)

Also :-/

Added RunKeeper provider

Fixed wrong variable name request_url, changed to request_uri accordi…

…ng to OAuth2 specs

Updated README and small fixes

Fixed typo in composer.json

Converted into a composer package

Updated readme for proper use of "OAuth2" wording

Made provider instance creation use a more CI-like syntax and bumped …

…to 0.1.0.

Added GitHub as a provider. Requires a HTTPS callback