Elaborated on cli

[nickyout]

Hello. I like the functionality the json-schema-generator tool provides, but I've found its cli to be less intuitive than I am used to. I also tried to npm install -g it but it did not work. So I went and... changed a lot.

• npm install -g json-schema-generator should work now
• json-schema-generator --help pops up help with all command line options
• It handles stdin and stdout now. You can do cat input.json | json-schema-generator - > output.json
• If schemadir ends with .json, it is assumed to be a destination file name now.
• The first arg that is not (part of) an option gets interpreted and yields to --file, --url, or --stdin. Should be easier to use.
• The API should be fully backwards-compatible.
• Added test cases in ./test/cli-test.js that test all i/o variations. Run npm test ./test/cli-test.js to see.
• require('json-schema-generator') will now return only a function that accepts a js object and outputs a json schema js object. It can be browserified and it seems to work (tested in chrome). but I don't know if you care for such things.

And I did not make handy separate commits of it, so you can't really select the parts you like easily. Sorry about that.

I hope you like the change and consider merging it back into your master and making a new npm release. Any remarks are welcome.

[krg7880]

Excellent! Seems to still work. Thanks for contributing.

[nickyout]

I noticed that despite my addition of pretty-data to package.json, it is still not being installed automatically. Apparently I had to run npm shrinkwrap and commit the new npm-shrinkwrap.json. I also have some other minor things I just found. I'm making another pull request.