Update travis matrix

Fix specs for postgresql

.travis.yml

@@ -3,15 +3,19 @@ rvm:
   - 2.0.0
   - 2.1.1
   - rbx-2
+  - ruby-head
+
 env:
   - DB=sqlite3
   - DB=mysql
   - DB=postgresql
+
 gemfile:
   - gemfiles/activerecord_3.2.gemfile
   - gemfiles/activerecord_4.0.gemfile
   - gemfiles/activerecord_4.1.gemfile
   - gemfiles/activerecord_edge.gemfile
+
 cache: bundler
 script: bundle exec rake
 before_install: gem install bundler
@@ -20,4 +24,19 @@ matrix:
   fast_finish: true
   allow_failures:
       - gemfile: gemfiles/activerecord_edge.gemfile
-      - rvm: rbx-2
+      - rvm: rbx-2
+  exclude:
+      - rvm: 1.9.3
+        gemfile: ci/Gemfile.activerecord-4.0.x
+      - rvm: 1.9.3
+        gemfile: ci/Gemfile.activerecord-4.1.x
+      - rvm: 1.9.3
+        gemfile: ci/Gemfile.activerecord-edge
+      - rvm: rbx-2
+        gemfile: ci/Gemfile.activerecord-3.2.x
+      - rvm: ruby-head
+        gemfile: ci/Gemfile.activerecord-3.2.x
+      - rvm: ruby-head
+        gemfile: ci/Gemfile.activerecord-4.0.x
+      - rvm: ruby-head
+        gemfile: ci/Gemfile.activerecord-4.1.x

spec/acts_as_taggable_on/tagging_spec.rb

@@ -34,7 +34,7 @@
     expect(taggable.tag_list).to eq(['bug'])
 
     another_taggable = TaggableModel.where('id != ?', taggable.id).sample
-    expect(another_taggable.tag_list).to eq(%w(very serious bug))
+    expect(another_taggable.tag_list.sort).to eq(%w(very serious bug).sort)
   end
 
   pending 'context scopes' do