Add ccw.util.edn/read-vector for reading vectors from EDN strings
cmdhistory: Use util.edn/read-vector in get-history (Fix Issue 576)
ccw.util.edn: Wrap tests in deftest
ccw.util.edn: Move tests to ccw.util.edn-test

This matches the test namespace naming convention used by Leiningen's default
template.

--HG--
extra : amend_source : 45c63c8ea5842ba524d346047c620c4c203b74cd

Conflicts:

	ccw.core/.settings/ccw.repl.cmdhistory.prefs