feat: Support for custom context and/or debug html files

[ghost]

This is a replacement for the pull request #1360. I have updated the code for the latest master. There was also a bug in the old pull request code because requestUrl was overwritten. I have also added support for absolute paths.

[GitCop]

There were the following issues with your Pull Request

• Commit: 94824e8
  • Commits must be in the following format: %{type}(%{scope}): %{description}

Guidelines are available at http://karma-runner.github.io/0.13/dev/git-commit-msg.html

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[ghost]

If you tell me the correct scope, I can add it to the commit message.

[dignifiedquire]

You can leave the scope out that's okay, but this is still missing some stuff I mentioned in the other PR

• update the docs so people can find these options
• these options shouldn't be nested in the client configs, they should be top level and default to the ones karma brings
• path normalization and setting defaults should be done in lib/config.js

[dignifiedquire]

ping @sanjo

[ghost]

The changes that you wrote in #1586 (comment) still need to be done.

[dignifiedquire]

Closing in favor of #1825

[durgesh-priyaranjan]

Is this change published to npm?