automate module creation

[millermedeiros]

The way the node build command works nowadays is kinda dumb since it will update packages even if not necessary and it doesn't check if each module contains a proper spec file and documentation.

I think it's time to add command line arguments to the build. We should automate the way a new module is created adding a new source file, a failing spec and update the spec runner and packages automatically during insertion. We should also add a command to refresh the packages as well in case user decides to add new modules manually.

Example:

$ node build add array/invoke
    created:
      - src/array/invoke.js
      - tests/spec/array/spec-invoke.js
    updated:
      - src/array.js
      - tests/spec/spec-array.js