misc/ruby-electric.el: Import version 2.1.1.

  * ruby-electric-delete-backward-char: Enable support for number
    prefix.

  * ruby-electric-curlies: Fix electric operation after an open
    curly.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44261 b2dd03c8-39d4-4d8f-98ff-823fe69b080e