Print test names in cljs 0.0-1803

Persistent data structures no longer implement .toString
Update travis to work on lein 2.1.2

This is just a workaround for technomancy/leiningen#1120, which is fixed
in 2.1.3 and above.
Merge pull request #5 from trptcolin/test_names

Print test names in cljs 0.0-1803