tests/vararg, README: finish vararg implementation
README: update install instructions (fixes #3)

Updated to include necessary install of `ocamlfind` tool before being
able to successfully run `make`.
codegen: error out if &rest appears in-body
README: add a couple of todo items
Add bool? predicate
Merge pull request #5 from toroidal-code/boolp

Add bool? predicate
Add oasis configuration
Fix REPL
Fix bindings.c compat problems