therubyracer is very unstable/crashes often on rbx,jruby and maglev - revert to less 1.x for those

Gemfile

@@ -29,7 +29,6 @@ gem 'haml', '>= 3.0'
 gem 'sass'
 gem 'builder'
 gem 'erubis'
-gem 'less', '~> 2.0'
 gem 'liquid'
 gem 'slim', '~> 1.0'
 gem 'temple', '!= 0.3.3'
@@ -47,6 +46,12 @@ else
   gem 'nokogiri'
 end
 
+if RUBY_ENGINE == "ruby"
+  gem 'less', '~> 2.0'
+else
+  gem 'less', '~> 1.0'
+end
+
 unless RUBY_ENGINE == 'jruby' && JRUBY_VERSION < "1.6.1" && !ENV['TRAVIS']
   # C extensions
   gem 'rdiscount'

test/less_test.rb

@@ -16,7 +16,7 @@ class LessTest < Test::Unit::TestCase
   it 'renders inline Less strings' do
     less_app { less "@white_color: #fff; #main { background-color: @white_color }" }
     assert ok?
-    assert_body "#main {background-color: #ffffff;}"
+    assert_equal "#main{background-color:#ffffff;}", body.gsub(/\s/, "")
   end
 
   it 'defaults content type to css' do
@@ -45,13 +45,13 @@ class LessTest < Test::Unit::TestCase
   it 'renders .less files in views path' do
     less_app { less :hello }
     assert ok?
-    assert_body "#main {background-color: #ffffff;}"
+    assert_equal "#main{background-color:#ffffff;}", body.gsub(/\s/, "")
   end
 
   it 'ignores the layout option' do
     less_app { less :hello, :layout => :layout2 }
     assert ok?
-    assert_body "#main {background-color: #ffffff;}"
+    assert_equal "#main{background-color:#ffffff;}", body.gsub(/\s/, "")
   end
 
   it "raises error if template not found" do