Support language_version for ruby as well.

testing/resources/ruby_1_9_3_p547_hooks_repo/.gitignore

@@ -0,0 +1 @@
+*.gem

testing/resources/ruby_1_9_3_p547_hooks_repo/bin/ruby_hook

@@ -0,0 +1,5 @@
+#!/usr/bin/env ruby
+
+puts RUBY_VERSION
+puts RUBY_PATCHLEVEL
+puts 'Hello world from a ruby hook'

testing/resources/ruby_1_9_3_p547_hooks_repo/hooks.yaml

@@ -0,0 +1,5 @@
+-   id: ruby_hook
+    name: Ruby Hook
+    entry: ruby_hook
+    language: ruby
+    language_version: 1.9.3-p547

testing/resources/ruby_1_9_3_p547_hooks_repo/ruby_hook.gemspec

@@ -0,0 +1,9 @@
+Gem::Specification.new do |s|
+    s.name = 'ruby_hook'
+    s.version = '0.1.0'
+    s.authors = ['Anthony Sottile']
+    s.summary = 'A ruby hook!'
+    s.description = 'A ruby hook!'
+    s.files = ['bin/ruby_hook']
+    s.executables = ['ruby_hook']
+end