Pass vendor files as helpers to node-jasmine.

[bryanbraun]

We came across an issue where we needed to pass vendor files in above specfiles for node-jasmine. This change allows the option to be passed through.

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For details on helpers, see: http://jasmine.github.io/2.4/node.html#section-12

See also, about jasmine.loadConfig: http://jasmine.github.io/2.4/node.html#section-Load_configuration_from_a_file_or_from_an_object.

[dflynn15]

This allows the change to work for Unit tests running against Jasmine's CLI, however the same scenario could exist for Integration tests run through Phantom as well.

Would you mind adding the following:

• Handling the same scenario for integration tests run through PhantomJS
• Updating the README to account for the changes.

Thanks!