package.json optimizations

[stevenvachon]

bin and lib paths are already relative to the package.json file.

bin only needs to be an object if the executable name differs from name or when supplying multiple names.

files makes npm install --production installs much lighter.

scripts don't need to target executables directly as they are added to PATH during npm install.

[stevenvachon]

Sorry for the ridiculous amount of commits; I was using github.com's editor and missed things.

[flosse]

thx!

[stevenvachon]

No prob!