added a preliminary reader mode, so
added a preliminary reader mode, so

#lang planet me mylanguage.plt 3 4

gets the named planet package, gets lang/reader.ss, and uses it as the reader.

svn: r7778

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket