ParseTree version 2.2.0 has been released!

ParseTree is a C extension (using RubyInline) that extracts the parse
tree for an entire class or a specific method and returns it as a
s-expression (aka sexp) using ruby's arrays, strings, symbols, and
integers.

As an example:

def conditional1(arg1)
if arg1 == 0 then
return 1
end
return 0
end

becomes:

[:defn,
:conditional1,
[:scope,
[:block,
[:args, :arg1],
[:if,
[:call, [:lvar, :arg1], :==, [:array, [:lit, 0]]],
[:return, [:lit, 1]],
nil],
[:return, [:lit, 0]]]]]

Changes:

### 2.2.0 / 2008-06-09

* 18 minor enhancements:

* Added 1.9 and rubinius to multiruby skip list.
* Added 1.9 fixes for SexpProcessor.
* Added compatibility changes for regexp option values.
* Added custom compact since Array#compact is hostile to subclasses.
* Added some tests for wonky index edge cases. some commented out.
* Added test changes for 1.9 and r2r changes. Esp fixed regexp differences.
* Added tests for dasgn, proc arities,
* Added/updated some tests for ruby_parser.
* Changed tests to default to nil for verbose.
* Fixed all assertions deprecated in miniunit.
* Raises LoadError if incompatible ruby, allows fallback to ruby_parser.
* Removed Unified's rewrite_fbody and moved up into defn... not sure about that.
* Removed argscat rewriter from unified_ruby.rb
* Renamed shadowed variable name.
* Reworked parse_tree_for_(method|string) to take optional verbose arg.
* Started removing ending newlines from pt_testcase.rb.
* Uncommented all commented out tests. ruby_parser must not be a pansy.
* Updated rakefile for new hoe abilities.

* 3 bug fixes:

* Fixed 1.8.[45] wrt dasgn_curr declaration removal.
* Fixed pt_testcase bug.
* Fixes for colon2/3 in class/module/cdecls.