Fix default test path and fix broken test in core

This commit does the following:

* Move the `:test-paths ["test/clj"]` in the project file up to the
  root level of the project file.  It had previously been located
  inside of a profile.  My understanding is that when you define
  these path settings inside of a profile, they do not override
  the project-wide values, but rather supplement them.  In this
  case, the default is `test`, but our tests actually live in
  `test/clj`.  This was causing IDEA to incorrectly set up the
  source paths (and, technically, I believe it would make the
  namespaces in our clojure test code invalid).
* Fix some errant parens in `core_test`; the final test in the
  file was outside of a `deftest` block, and thus was not
  actually being run.