update parser to use 2.6

was choking on &. syntax
improved error reporting slightly

lib/ruby.rb

@@ -1,4 +1,4 @@
-require "parser/ruby22"
+require "parser/current"
 require "ast"
 
 AST::Node.class_eval do

lib/ruby/ruby_compiler.rb

@@ -29,8 +29,17 @@ module Ruby
     include AST::Sexp
 
     def self.compile(input)
-      ast = Parser::Ruby22.parse( input )
-      self.new.process(ast)
+      begin
+        ast = Parser::CurrentRuby.parse( input )
+      rescue => e
+        puts "Error parsing #{input}"
+      end
+      begin
+        self.new.process(ast)
+      rescue => e
+        puts "Error processing #{ast}"
+        raise e
+      end
     end
 
     # raise a ProcessError. This means ruby-x doesn't know how to handle it.