If TEST_JUNIT_XML_PATH is set, output JUnit XML format test results

spec/jasmine-test-runner.coffee

@@ -7,6 +7,10 @@ module.exports = ({logFile, headless, testPaths, buildAtomEnvironment}) ->
   window[key] = value for key, value of require '../vendor/jasmine'
   require 'jasmine-tagged'
 
+  if process.env.TEST_JUNIT_XML_PATH
+    require 'jasmine-reporters'
+    jasmine.getEnv().addReporter new jasmine.JUnitXmlReporter(process.env.TEST_JUNIT_XML_PATH, true, true)
+
   # Allow document.title to be assigned in specs without screwing up spec window title
   documentTitle = null
   Object.defineProperty document, 'title',