Tests should use Firefox instead of PhantomJS in CI

[benjaminapetersen]

• PhantomJS is only temporary, lets get back to Firefox

    karma: {
      options: {
        configFile: 'test/karma.conf.js',
        // default in karma.conf.js is Firefox, however, Chrome has much better
        // error messages when writing tests.  Call like this:
        // grunt test
        // grunt test --browsers=Chrome
        // grunt test --browsers=Chrome,Firefox,Safari (be sure karma-<browser_name>-launcher is installed)
        browsers: grunt.option('browsers') ?
                    grunt.option('browsers').split(',') :
                    // if running locally on mac, we can test both FF & Chrome,
                    // in Travis, just FF
                    // ['Nightmare'] is a good alt for a current headless
                    // FIXME: fix this, PhantomJS is deprecated
                    isMac ?
                      ['Firefox', 'Chrome'] :
                      ['PhantomJS']
      },
      unit: {
        singleRun: true,
      }
    },

• Will also need to turn the display stuff back on in the .travis.yml

Original comment in this PR.

@spadgett

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