Added support for base32 and base64 numbers and double-quoted strings.
Okay, I think this finally fixes digraph highlighting for good.
Fixed rune highlighting at beginning and end of line.
Highlight tistis and hephep and recongize cenbar, etc. as constants.
Merge pull request #4 from philipcmonk/master

Added support for base32 and base64 numbers and double-quoted strings and fixed rune highlighting.