Log Message:
Update ruby-sexp-processor to 4.6.0.

=== 4.6.0 / 2015-05-28

* 2 minor enhancements:

  * Extended generate_test to deal with 19 and up.
  * Extended pt_testcase.rb so add_19tests means 19 and up.

* 1 bug fix:

  * Added and normalized tests to deal with canonicalized block args from \ 
ruby_parser.

=== 4.5.1 / 2015-04-27

* 1 minor enhancement:

  * Cache processors and rewriters. Significant speedup. (presidentbeef)