title: Error with the starting Karma Runner with frontend-maven-plugin
body: <p>I get the following error when trying to run the JS tests through <code>karma</code> with the <code>frontend-maven-plugin</code></p>
  
  <p><strong>Error:</strong></p>
  
  <pre><code>[ERROR] Failed to execute goal com.github.eirslett:frontend-maven-plugin:0.0.19:karma (javascript tests) on project karmaTest: Failed to run task: 'karma start src/test/javascript/karma.conf.ci.js --no-colors' failed. (error code 1) -&gt; [Help 1]
  org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.github.eirslett:frontend-maven-plugin:0.0.19:karma (javascript tests) on project karmaTest: Failed to run task
      at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
      at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
      at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
      at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:108)
      at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:76)
      at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
      at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:116)
      at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:361)
      at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155)
      at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)
      at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:213)
      at org.apache.maven.cli.MavenCli.main(MavenCli.java:157)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
      at java.lang.reflect.Method.invoke(Method.java:611)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
      at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
      at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
      at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
  Caused by: org.apache.maven.plugin.MojoFailureException: Failed to run task
      at com.github.eirslett.maven.plugins.frontend.mojo.KarmaRunMojo.execute(KarmaRunMojo.java:57)
      at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:133)
      at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)
      ... 19 more
  Caused by: com.github.eirslett.maven.plugins.frontend.lib.TaskRunnerException: 'karma start src/test/javascript/karma.conf.ci.js --no-colors' failed. (error code 1)
      at com.github.eirslett.maven.plugins.frontend.lib.NodeTaskExecutor.execute(NodeTaskExecutor.java:38)
      at com.github.eirslett.maven.plugins.frontend.mojo.KarmaRunMojo.execute(KarmaRunMojo.java:51)
  </code></pre>