alex/rply — pull request #3 by hirochachacha (2013-03-04 09:06:15+00:00)
Title: add ignore feature for lexer

Hi, I've implemented simple ignoring feature like:

```
lg = LexerGenerator()

lg.add("PLUS", r"\+")
lg.add("MINUS", r"-")
lg.add("NUMBER", r"\d+")

lg.ignore("SPACING", r"\s+")
```

Thank you.