Add "file" and "system" packages to depedencies

[rogeriopvl]

This fixes #57

@zaach jsonlint is kind of abandoned. Let me know if you need help maintaining this project. I would be glad to help out :)

[zaach]

file and system... wait a sec, are those from the old support of Narwhal in jison?? Um, it might be time to regenerate the parser.

[ronkorving]

It might also be time to add contributors :) (no sarcasm intended)

[evaliyev]

Please merge this pull request!

[prantlf]

Why do the packages file and system have to be added to the dependencies of this package? And not just to "devDependencies", but to "dependencies". As such they would get installed by anyon, including people, who do not work with browserify. Should not those projects, which use browserify, depend on those two packages in their package.json files?

[evaliyev]

system and file are used in lib/jsonlint.js in the node environment at runtime (https://github.com/zaach/jsonlint/blob/master/lib/jsonlint.js#L430 and https://github.com/zaach/jsonlint/blob/master/lib/jsonlint.js#L424). I would leave them in dependencies.