Quickly convert Ruby blocks between {} and begin/end.
Trigger the conversion with :B or <leader>B.
From http://eigenclass.org/hiki/Ruby+block+conversion+macros+for+Vim
--------
When committing to this repo, make sure the author date matches the
upstream release date. For 0.1 released on 2005-11-14:
$ GIT_AUTHOR_DATE=2005-11-14T00:00:00 git commit
$ GIT_COMMITTER_DATE=2005-11-14T00:00:00 git tag -a 0.1