Add gershwin.edn namespace
Correct implementation of instance? word
Provide alias vals for values
Implement naive mapcat
Implement more of the "Seq API", incl. repeat, interpose, and friends
Implement helpers for indexOf and lastIndexOf, also re-find
Make REPL print of lazy seqs unique for each instance
Add method to GershwinStack to get raw stack
Add exit-on-fail helper to test "framework"
Add better println's and tidy up test runner
Implement more of gershwin.java.io