Log Message:
Update ruby-parser to 3.1.1.

=== 3.1.1 / 2012-12-19

* 1 minor enhancement:

  * Added MOVE_TIMEOUT env var for ruby_parse_extract_error to move slow files \ 
to a sibling directory

* 4 bug fixes:

  * 1.9: Fixed lexing of "0o". (whitequark)
  * 1.9: Fixed parsing of unary plus on literals. (whitequark)
  * Added timeout arg to RubyParser#process to pass through to the real parser
  * Updated Synopsis to reflect new options for running RP. (louismullie)

=== 3.1.0 / 2012-12-06

* 2 minor enhancements:

  * Added RubyParser.for_current_ruby to provide a parser that matches your \ 
runtime. (neilconway)
  * Duck-typed IDENT_CHAR_RE instead of using RUBY_VERSION

* 3 bug fixes:

  * Cleared out body comments in class/module/defn/defs
  * Flipped lexer tests to US-ASCII to avoid encoding hell
  * yyerror is now an alias for syntax_error