Slight tweaks to Clojure runner
- Only running tests for the testing namespace
- No longer writing log files
Preventing java from writing error files
Drying out common code
Merge branch 'clojure-tweaks' of https://github.com/xcthulhu/codewars-runner into xcthulhu-clojure-tweaks

Conflicts:
	lib/runners/java.js
Merge branch 'master' of https://github.com/Codewars/codewars-runner