Added cli argument for tab width.

[musicist288]

Hey, love the gem. I added a cli argument for setting the tab width of the beautifier so I can automate it as part of a build process I have in place for converting PHP templates into static HTML. Just though you might like it.

[threedaymonk]

Thanks, this seems useful. I'll try to look over it and merge it in in the next week or so.

[threedaymonk]

Thanks for this. There are a few things that I'd like to change, though:

• Use 2 spaces for indentation in Ruby as in the other source files!
• Be consistent about naming, i.e. use tab_stops everywhere in the code, and --tab-stops for the command-line argument.
• Preserve the existing behaviour: calling the executable with no arguments should still process from standard input to standard output.
• Allow tab stops to be specified when operating on standard input and output.
• Add a -h/--help to show the command-line options.

If you'd like to take this on, let me know, otherwise I'll do it.

[musicist288]

Thanks for looking it over. I can make these changes. I send another pull request when they're done.

[threedaymonk]

I'm really sorry. I didn't see that you had addressed my suggestions until I was checking other pull requests today.