Include a speculative lexing.
Doublequote strings with interior escapes.
Don't report syntax errors in lexer-only runs.
Single-quoted strings with internal escapes.
Lex start, middle, end, or complete "-strings.
Parse interpolated strings.
Target parse tree for string interpolations.
Allow seg_token_without to trim from both ends.
AST node for string constants.
Parse interpolated string parts into << methodcalls.
Visit string nodes.
Print STRING nodes correctly.

Hey, look at that, I forgot a `break;`. I guess that's how you know you're
coding in C.
Parse interpolation differently.
Merge pull request #9 from smashwilson/strings

Strings