Ensure Scopes context key are generated as valid Go names
As highlighted by @KenxinKun in #874, gorilla/mux (as well as some other servers) were affected by an invalid Scopes context key.
This makes them valid Go names.
As highlighted by @KenxinKun in #874, gorilla/mux (as well as some other servers) were affected by an invalid Scopes context key.
This makes them valid Go names.