Use a more recent `ruby-build` version

• Use a more recent ruby-build version (#156)

Bump ruby-build to v20161225 and rbenv to v1.1.0

• Updates ruby-build to v20161225 (#155)
• Updates rbenv to v1.1.0 (#155)

Merge pull request #141 from salimane/plugin

Fix plugin type throwing error when not installing through hiera yaml

Update ruby-build version from v20151216 to v20160130

Merge pull request #147 from cdenneen/patch-1

Updated ruby-build

Update ruby-build version from v20151024 to v20151216

Merge pull request #146 from nhocki/patch-1

Update ruby-build version (v20150413 -> v20151024)

Merge pull request #144 from orien/update_rubybuild

Update ruby-build version (v20150413 -> v20151024)

8.5.2: Merge pull request #125 from salimane/rbenv_plugins

Based on #93 , bring back rbenv plungins support.

8.5.1: Merge pull request #138 from dbussink/dbussink/github-ruby-2-1-6

GitHub Ruby 2.1.6

8.5.0: Merge pull request #137 from boxen/binary-tweaks

• use https for binaries
• support more Homebrew root binaries. Binaries can now be uploaded for non-default Homebrew locations so let's use them when they are available.

8.4.1: Merge pull request #135 from boxen/custom-homebrew

• support non-/opt/boxen/homebrew Homebrew installations
• use 1.8.7p375 for OS X 10.10 support