Custom Jasmine Reporters

[juanger]

As part of the upgrade to Jasmine 2, the reporter functionality stopped to work, I added the feature back in a more generic approach. Essentially you bring your own reporters as assets and add them to the configuration file in this way:

reporters:
  junit:
    - "junit_reporter.js"
    - "junit_reporter.boot.js"

And then you can run guard with the --reporters junit flag

[nathanstitt]

Thanks @juanger - the custom reporters will be good to support. I'm going to merge this and then see if I can mixup the tests.