Fix a bug in the parser.

Also uncommented a few tests that work now thanks to this fix.
Added DEFSYNTAX.

This is the not-quite-first pass at a form for defining arbitrary syntax.
Add a README.
Merge branch 'refs/heads/master' into new-master

Conflicts:
	package.lisp
	scala-tests.lisp
	yacc-is-dead.asd
Fix an old package name.
Fix sexp test.