Package.json file added

No dependencies that I know of. I did wire up the test command to test.js. Should close Issue 2 (gh-3). I tested with another package using this as a dependency via the github download link, e.g.:
  
    ...
    "devDependencies" : {
        "amf": "https://github.com/cbosco/node-amf/tarball/master"
    }
    ...