Add rubinius

Bump rails 3_1 version to rc6

.travis.yml

@@ -2,6 +2,8 @@ rvm:
   - 1.8.7
   - 1.9.2
   - ree
+  - rbx-2.0
+  
 script: "bundle exec rake clean test"
 gemfile:
   - gemfiles/rails2.gemfile

gemfiles/rails3_1.gemfile

@@ -3,7 +3,7 @@
 source "http://rubygems.org"
 
 gem "sqlite3", "~>1.3.4"
-gem "rails", "~> 3.1.0.rc5"
+gem "rails", "~> 3.1.0.rc6"
 gem "activerecord", :require=>"active_record"
 gem "cocaine"
 gem "rake"

gemfiles/rails3_1.gemfile.lock

 GEM
   remote: http://rubygems.org/
   specs:
-    actionmailer (3.1.0.rc5)
-      actionpack (= 3.1.0.rc5)
+    actionmailer (3.1.0.rc6)
+      actionpack (= 3.1.0.rc6)
       mail (~> 2.3.0)
-    actionpack (3.1.0.rc5)
-      activemodel (= 3.1.0.rc5)
-      activesupport (= 3.1.0.rc5)
+    actionpack (3.1.0.rc6)
+      activemodel (= 3.1.0.rc6)
+      activesupport (= 3.1.0.rc6)
       builder (~> 3.0.0)
       erubis (~> 2.7.0)
       i18n (~> 0.6)
-      rack (~> 1.3.1)
+      rack (~> 1.3.2)
       rack-cache (~> 1.0.2)
       rack-mount (~> 0.8.1)
       rack-test (~> 0.6.0)
       sprockets (~> 2.0.0.beta.12)
-    activemodel (3.1.0.rc5)
-      activesupport (= 3.1.0.rc5)
+    activemodel (3.1.0.rc6)
+      activesupport (= 3.1.0.rc6)
       bcrypt-ruby (~> 2.1.4)
       builder (~> 3.0.0)
       i18n (~> 0.6)
-    activerecord (3.1.0.rc5)
-      activemodel (= 3.1.0.rc5)
-      activesupport (= 3.1.0.rc5)
-      arel (~> 2.1.4)
+    activerecord (3.1.0.rc6)
+      activemodel (= 3.1.0.rc6)
+      activesupport (= 3.1.0.rc6)
+      arel (~> 2.2.1)
       tzinfo (~> 0.3.29)
-    activeresource (3.1.0.rc5)
-      activemodel (= 3.1.0.rc5)
-      activesupport (= 3.1.0.rc5)
-    activesupport (3.1.0.rc5)
+    activeresource (3.1.0.rc6)
+      activemodel (= 3.1.0.rc6)
+      activesupport (= 3.1.0.rc6)
+    activesupport (3.1.0.rc6)
       multi_json (~> 1.0)
     appraisal (0.3.7)
       aruba (~> 0.4.2)
       bundler
       rake
-    arel (2.1.4)
+    arel (2.2.1)
     aruba (0.4.5)
       bcat (>= 0.6.1)
       childprocess (>= 0.1.9)
@@ -80,7 +80,7 @@ GEM
       json (>= 1.4.6)
     gherkin (2.4.5-java)
       json (>= 1.4.6)
-    hike (1.2.0)
+    hike (1.2.1)
     i18n (0.6.0)
     jruby-openssl (0.7.4)
       bouncy-castle-java
@@ -102,30 +102,30 @@ GEM
     rack (1.3.2)
     rack-cache (1.0.2)
       rack (>= 0.4)
-    rack-mount (0.8.1)
+    rack-mount (0.8.2)
       rack (>= 1.0.0)
     rack-ssl (1.3.2)
       rack
     rack-test (0.6.1)
       rack (>= 1.0)
-    rails (3.1.0.rc5)
-      actionmailer (= 3.1.0.rc5)
-      actionpack (= 3.1.0.rc5)
-      activerecord (= 3.1.0.rc5)
-      activeresource (= 3.1.0.rc5)
-      activesupport (= 3.1.0.rc5)
+    rails (3.1.0.rc6)
+      actionmailer (= 3.1.0.rc6)
+      actionpack (= 3.1.0.rc6)
+      activerecord (= 3.1.0.rc6)
+      activeresource (= 3.1.0.rc6)
+      activesupport (= 3.1.0.rc6)
       bundler (~> 1.0)
-      railties (= 3.1.0.rc5)
-    railties (3.1.0.rc5)
-      actionpack (= 3.1.0.rc5)
-      activesupport (= 3.1.0.rc5)
+      railties (= 3.1.0.rc6)
+    railties (3.1.0.rc6)
+      actionpack (= 3.1.0.rc6)
+      activesupport (= 3.1.0.rc6)
       rack-ssl (~> 1.3.2)
       rake (>= 0.8.7)
       rdoc (~> 3.4)
       thor (~> 0.14.6)
     rake (0.9.2)
     rdiscount (1.6.8)
-    rdoc (3.9.1)
+    rdoc (3.9.2)
     rspec (2.6.0)
       rspec-core (~> 2.6.0)
       rspec-expectations (~> 2.6.0)
@@ -139,7 +139,7 @@ GEM
     sprockets (2.0.0.beta.13)
       hike (~> 1.2)
       rack (~> 1.0)
-      tilt (!= 1.3.0, ~> 1.1)
+      tilt (~> 1.1, != 1.3.0)
     sqlite3 (1.3.4)
     term-ansicolor (1.0.6)
     thor (0.14.6)
@@ -164,7 +164,7 @@ DEPENDENCIES
   jruby-openssl
   mime-types
   mocha
-  rails (~> 3.1.0.rc5)
+  rails (~> 3.1.0.rc6)
   rake
   rdoc
   shoulda