Merge from upstream ruby-mode.el

Merge from upstream ruby-mode.el
* lisp/progmodes/ruby-mode.el (ruby-mode-map): Remove unnecessary
binding for `newline'.
(ruby-move-to-block): When moving backward, stop at block opening,
not indentation.
* progmodes/ruby-mode.el (ruby-brace-to-do-end)
(ruby-do-end-to-brace, ruby-toggle-block): New functions.
* progmodes/ruby-mode.el (ruby-mode-map): Add binding for
`ruby-toggle-block'.
* test/automated/ruby-mode-tests.el (ruby-move-to-block-stops-at-opening)
(ruby-toggle-block-to-do-end, ruby-toggle-block-to-brace): New test.