Squashed 'rbenv/plugins/ruby-build/' changes from 3190b36..b998838

b998838 Merge pull request #627 from sstephenson/list-custom-definitions
311d96f Fix `rbenv install --list` for definitions auto-discovery
f8015da Fix output assertion
7a17175 ruby-build 20140905
736b229 Merge pull request #624 from chulkilee/jruby-1.7.15
75573f0 add jruby-1.7.15
85369d2 Merge pull request #620 from patricknavarromahoney/master
ee41f90 add jruby 1.7.14 build

git-subtree-dir: rbenv/plugins/ruby-build
git-subtree-split: b998838d42bfdacd49bcebf42df0d95848386105
Merge commit 'bd9cfa511a7937e5dabce5328657d509bb9b5530'

Pull sstephenson/ruby-build to `rbenv/plugins/ruby-build`.
Set listchars for `set list`
Update brews for Vim to support latest Ruby