Factor out parsing of feedid/articleid.
Factor out parsing of feedid/articleid.

Also move grabbing arg info out of environ into the arg parsing
routine.  Because of the design of my dispatcher, the args are
*always* at the end.  (I break RESTFul conventions, but they are,
after all, only conventions.)

bitdancer/syndicalist,bitdancer/syndicalist,bitdancer/syndicalist