* lisp/progmodes/ruby-mode.el (ruby-move-to-block): Looks for a block

* lisp/progmodes/ruby-mode.el (ruby-move-to-block): Looks for a block
start/end keyword a bit harder.  Works with different values of N.
Add more comments.
(ruby-end-of-block): Update accordingly.

* test/automated/ruby-mode-tests.el (ruby-heredoc-font-lock)
(ruby-singleton-class-no-heredoc-font-lock)
(ruby-add-log-current-method-examples): New tests.
(ruby-test-string): Extract from ruby-should-indent-buffer.
(ruby-deftest-move-to-block): New macro.
Add several move-to-block tests.