Log Message:
Update ruby-parser package to 2.2.0.

=== 2.2.0 / 2011-08-23

* 2 minor enhancements:

  * Moved Keyword, Environment, and StackState inside of RubyParser
  * Added proper dsym and dsym->sym support.

* 3 bug fixes:

  * Added extra (failing) tests for call/iter line number checking (quix)
  * Fixed line numbers for certain call/iter edge cases
  * Fixed parsing of: alias :"<<" :">>".