This addresses [Issue #409](http://code.google.com/p/phantomjs/issues/detail?id=409).
The script:
* Get the latest code. Since LineNoise is pretty small, grabbing the tarball straight from the repo should be just fine.
* Extract and place the files in the right directory (src/linenoise).
* Remove unnecessary stuff (project files etc).
* Update the src/linenoise/README.md to refer to the revision being imported.