Add comments, additional locals that pass to middleware but don't serialize to txn.
Add comments, additional locals that pass to middleware but don't serialize to txn.

saurabh-malik/oauth2orize,eskygo/oauth2orize,mattyao1984/oauth2orize,Sajan129/oauth2orize,DaAwesomeP/oauth2orize,jaredhanson/oauth2orize,rakesh-mohanta/oauth2orize