Bitwise operators

[markosski]

Hi there, would like to contribute to your project. Many databases support bitwise operations so I think this would be useful.

[stephentu]

@martez81: I am not actively maintaining this project, but if you submit a PR with these changes I will happily merge your code.

[markosski]

@stephentu thanks. Do you know of any other Scala based SQL parsers that are more complete?