* misc/ruby-additional.el: Use preceding-char/following-char
  (returning 0 at BOF/EOF) instead of char-before/char-after
  (returning nil at BOF/EOF) to avoid error from char-syntax when
  at BOF/EOF.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43182 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Make ruby-electric play nicely with smartparens-mode.

* misc/ruby-electric.el (ruby-electric-space-can-be-expanded-p):
  Return nil to avoid "end" insertion when in smartparens-mode
  that is configured to insert "end" for the same keyword.

* misc/ruby-electric.el (ruby-electric-keywords): New custom
  variable to replace `ruby-electric-simple-keywords-re` with.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43183 b2dd03c8-39d4-4d8f-98ff-823fe69b080e