Add streams support

Now you can finally use NodeJS streams with parserblade. See docs for more.

Unfortunately, streams for YAML won't be supported for now. Sorry.

Add support for valid()

Now you can call <any>.valid(<data>, <options>) to check if given data is a valid CSV, XML, JSON or YAML without having to parse it!

First release!

Merge pull request #12 from onhernandes/dev

First release!