Ruby compatibility issues

- regexp engines are different from 1.8 to 1.9, fixed the literal shorthand regexp accordingly
  - changed the shorthand regexp text from a match to a string scan
  - test_helper now loads rubygems unless RUBY_VERSION is > 1.9

lib/liquid.rb

@@ -45,7 +45,7 @@ module Liquid
   PartialTemplateParser       = /#{TagStart}.*?#{TagEnd}|#{VariableStart}.*?#{VariableIncompleteEnd}/
   TemplateParser              = /(#{PartialTemplateParser}|#{AnyStartingTag})/
   VariableParser              = /\[[^\]]+\]|#{VariableSegment}+\??/
-  LiteralShorthand            = /^(?:{{{\s?)(.*?)(?:\s*}}})$/
+  LiteralShorthand            = /^(?:\{\{\{\s?)(.*?)(?:\s*\}\}\})$/
 end
 
 require 'liquid/drop'

test/lib/liquid/regexp_test.rb

@@ -43,6 +43,7 @@ class RegexpTest < Test::Unit::TestCase
   end
 
   def test_literal_shorthand_regexp
-    assert_match "{{{ {% if 'gnomeslab' contains 'liquid' %}yes{% endif %} }}}", LiteralShorthand
+    assert_equal [["{% if 'gnomeslab' contains 'liquid' %}yes{% endif %}"]],
+    "{{{ {% if 'gnomeslab' contains 'liquid' %}yes{% endif %} }}}".scan(LiteralShorthand)
   end
 end # RegexpTest

test/test_helper.rb

@@ -2,6 +2,7 @@
 extras_path = File.join File.dirname(__FILE__), 'extra'
 $LOAD_PATH.unshift(extras_path) unless $LOAD_PATH.include? extras_path
 
+require 'rubygems' unless RUBY_VERSION =~ /^(?:1.9.*)$/
 require 'test/unit'
 require 'test/unit/assertions'
 require 'caller'