Can Wraith be used with Nightmare JS, instead of Phantom/CasperJs?

[vamsilax]

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Issue checklist:

• I have validated my config file against YAML Validator to make sure it is valid YAML.

• I have run the wraith info command and pasted the output below:

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• I have run the command in verbose mode (by adding verbose: true to my config) and pasted the output below:

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• I have pasted the contents of my config file below:

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