EventEmitter possible eventemitter memory leak

[jihoonl]

Warning while mochatest.

  ROS
    callOnConnection
(node) warning: possible EventEmitter memory leak detected. 11 listeners added. Use emitter.setMaxListeners() to increase limit.
Trace
    at EventEmitter.on (/home/jihoonl/research/node/roslibjs/node_modules/eventemitter2/lib/eventemitter2.js:391:19)
    at Context.<anonymous> (/home/jihoonl/research/node/roslibjs/test/ros.test.js:14:22)
    at callFn (/home/jihoonl/research/node/roslibjs/node_modules/grunt-mocha-test/node_modules/mocha/lib/runnable.js:223:21)
    at Test.Runnable.run (/home/jihoonl/research/node/roslibjs/node_modules/grunt-mocha-test/node_modules/mocha/lib/runnable.js:216:7)
    at Runner.runTest (/home/jihoonl/research/node/roslibjs/node_modules/grunt-mocha-test/node_modules/mocha/lib/runner.js:374:10)
    at /home/jihoonl/research/node/roslibjs/node_modules/grunt-mocha-test/node_modules/mocha/lib/runner.js:452:12
    at next (/home/jihoonl/research/node/roslibjs/node_modules/grunt-mocha-test/node_modules/mocha/lib/runner.js:299:14)
    at /home/jihoonl/research/node/roslibjs/node_modules/grunt-mocha-test/node_modules/mocha/lib/runner.js:309:7
    at next (/home/jihoonl/research/node/roslibjs/node_modules/grunt-mocha-test/node_modules/mocha/lib/runner.js:247:23)
    at Object._onImmediate (/home/jihoonl/research/node/roslibjs/node_modules/grunt-mocha-test/node_modules/mocha/lib/runner.js:276:5)
    at processImmediate [as _immediateCallback] (timers.js:330:15)
      ✓ should accept more than EventEmitter2's default listeners 

[syrnick]

The test subscribes 50 times and the warning triggers at 11. The warning is expected given what the test is doing. The fix for the test is to silence console output.