Added BrainF*ck Language

[espositoandrea]

I added a lexer for the BrainF*ck language.

This was my first time using Ruby, so I think it's a pretty dirty code, but it works. It can be improved in many ways, but it's a starting point.

[vidarh]

Hi, thanks for submitting your lexer. I'm trying to help clean out the pull request backlog... I've commented on a few things in your lexer. It'd be great if you take a look, and I'm sure we can get it tidied up so it can be included.

[espositoandrea]

After the useful comments of @vidarh I decided to revisit the BrainFuck lexer.

I have improved my knowledge of Ruby during this time so I wrote a much better lexer (improving a lot its complexity).

It's all written in :root, but given the fact that it's just made of four rules it's not a very big deal.

[vidarh]

@espositoandrea Wow that was a quick turnaround. (Don't worry about the CI failure; it's broken for all commits at the moment - we can rerun that once its fixed).

[vidarh]

@espositoandrea Just one more small nitpick: Can you fix the indentation so it's in line with the others? (2 spaces per indentation level)

[espositoandrea]

@vidarh sure! Done!

[pyrmont]

Hi there, @espositoandrea :) I posted a suggested change to your branch as a PR.

I might have screwed it up by rebasing against master first. If I did, feel free to just copy and paste into your own file!

[espositoandrea]

Hi, @pyrmont. I've merged your PR.

[pyrmont]

Thanks for contributing to Rouge! :)