Essential rbenv plugins

rbenv_plugin_list

For environment specific vars:  https://github.com/sstephenson/rbenv-vars
For handling gemsets:           https://github.com/jf/rbenv-gemset
Easily build rubies:            https://github.com/sstephenson/ruby-build
RbEnv driven Bundler:           https://github.com/carsomyr/rbenv-bundler
Find info on gems:              https://github.com/rkh/rbenv-whatis.git
Alias `use` & mimic rvm:        https://github.com/rkh/rbenv-use.git
Automatically rehash RbEnv:     https://github.com/sstephenson/rbenv-gem-rehash.git