https://github.com/maxxkrakoa/lineman-maven-plugin/issues/8

Partial resolution for issue #8 

`lineman build` seems to run with the additional npm and node paths defined. `npm install` still errors out.

I apologize for issuing a pull request that does not fully resolve the issue. My first experience with a maven plugin and my second project with node. I need some help figuring out how to make this really work as elegantly as it should.