Whalesong

This fork of Whalesong differs from dyoo/whalesong in the following ways:

• Builds on latest release of Racket (fixes the x undefined problem)
• Adds for (require whalesong/lang/for)
• Adds match (require whalesong/lang/match)
• Adds on-release (as a complement to on-key) Contributed by Darren Cruse
• Adds parameters (require whalesong/lang/parameters)
• Extended whalesong/image and whalesong/images (more functions, bug fixes, not matches WeScheme) Contributed by Emmanuel Schanzer

Note: The implementation of parameters works fine, as long as you don't mix parameterize with non-local-exits and reentries (i.e. call/cc and friends)

/soegaard