added restartOnFileChange karma config flag to test:watch command
added restartOnFileChange karma config flag to test:watch command

Since the tests can take a a while to run, I have often made changes before the tests have finished and then must wait a while before karma has a chance to re-run the tests. By turing _restartOnFileChange_ on, the current test run is terminated and a new one is started with the latest changes.

some documentation of the config flag https://github.com/karma-runner/karma/commit/1082f35
e-schultz/angular2-redux-example,stevenkampen/ng2-sequencer,rangle/ng2-redux-starter,e-schultz/angular2-redux-example,rangle/angular2-redux-starter,rangle/angular2-redux-starter,lokeshjain2008/ng2practice,tsungting/blue-bird,lokeshjain2008/ng2practice,rangle/ng2-redux-starter,tsungting/blue-bird,rangle/angular2-redux-starter,tsungting/blue-bird,javlaking/testangular2ci,javlaking/testangular2ci,javlaking/testangular2ci,e-schultz/angular2-redux-example,stevenkampen/ng2-sequencer,javlaking/testangular2ci,lokeshjain2008/ng2practice,tsungting/blue-bird,rangle/angular2-redux-starter,rangle/ng2-redux-starter,javlaking/testangular2ci,rangle/angular2-redux-starter,stevenkampen/ng2-sequencer,tsungting/blue-bird