Add Ruby Module.

Ruby is a popular language, and has a number of tools in its ecosystem
which support it.

RVM
-----

The most popular tool is RVM which lets you manage a multiplicity of
ruby interperters on your system in the event that you have a bunch of
different projects each requiring their own interpreter. If you have
RVM installed, this module sets it up for you.

Bundler
------

Lots of handly aliases for working with bundler which, is basically a
requirement for doing any sort of Ruby development.

modules/ruby/README.md

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+Ruby
+===
+
+Provides RVM integration and nice aliases for Ruby
+
+RVM
+---
+
+If you have RVM installed, this will automatically set it up without
+any required configuration to your dot files. To install RVM, see
+http://rvm.io
+
+Aliases
+-------
+
+### Ruby
+
+  - `rb` is short for `ruby`.
+
+### Bundler
+
+  - `rbb` bundle install
+  - `rbbc` bundle clean
+  - `rbbe` bundle exec
+  - `rbbi` bundle install --path vendor/bundle
+  - `rbbl` bundle list
+  - `rbbo` bundle open
+  - `rbbp` bundle package
+  - `rbbu` bundle update

modules/ruby/init.zsh

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+# Load RVM into the shell session.
+if [[ -s "$HOME/.rvm/scripts/rvm" ]]; then
+  # Unset AUTO_NAME_DIRS since auto adding variable-stored paths to ~ list
+  # conflicts with RVM.
+  unsetopt AUTO_NAME_DIRS
+
+  # Source RVM.
+  source "$HOME/.rvm/scripts/rvm"
+fi
+
+#
+# Aliases
+#
+
+# General
+alias rb='ruby'
+
+# Bundler
+alias rbb='bundle'
+alias rbbc='bundle clean'
+alias rbbe='bundle exec'
+alias rbbi='bundle install --path vendor/bundle'
+alias rbbl='bundle list'
+alias rbbo='bundle open'
+alias rbbp='bundle package'
+alias rbbu='bundle update'