Pick up state from request, if not specified.
Remove redundant "state=request.state" parameters
fix add_params_to_uri() fragment bug

add_params_to_uri() ovewrites existing fragment when fragment parameter = true
Merge pull request #280 from djpnewton/patch-1

fix add_params_to_uri() fragment bug
Merge pull request #278 from RodneyRichardson/issues/277/add-state-to-oauth2error

Issues/277/add state to oauth2error
Move identical token resposne parsing into base.
First step towards supporting JWT bearer grants.

Initial support is only for clients and need more unit tests
as well as real service tests.

Server support to come later.
Document environment variables
Merge pull request #282 from singingwolfboy/document-envvars

Document environment variables