Fall-through to next middleware if Authorization isn't of type Bearer.
Fall-through to next middleware if Authorization isn't of type Bearer.

This should allow standard HTTP auth to function in a subsequent
middleware down the stack.

Closes #6

jkeczan/OpenIDConnect,envisionme/node-oauth2-provider,agmoyano/OpenIDConnect,steverc/OpenIDConnect,finebraincom/node-oauth2-provider,pythian/OpenIDConnect,GerardSoleCa/node-oauth2-provider,ammmir/node-oauth2-provider,hjj1000/node-oauth2-provider,ariutta/OpenIDConnect