Add support for Npm.Publish

[pascalberger]

Support for the npm publish command would be nice.

[pascalberger]

@FlorianHockmann Are you interested in testing? There is a version available here which contains an NpmPublish alias.

[FlorianHockmann]

@pascalberger I just tried it out and from the first impression it looks good, but I'm missing an option to specify the registry as I don't want my package to be published to the default registry. A property in the respective settings for the registry would be helpful. Currently I am simply issuing the following command from PowerShell:
npm publish $package --registry $registryUrl

[pascalberger]

@FlorianHockmann I added a Registry parameter to the settings class which alows to add the --registry parameter. A new test build is available here.

[FlorianHockmann]

Thanks @pascalberger, I just tried the test build and it works as expected :-)

[pascalberger]

@FlorianHockmann It's now released: https://www.nuget.org/packages/Cake.Npm/0.10.0

Including support for --tag, --access parameters and a fluent syntax for generating the settings object.