Stop testing Rails 3.0 with Ruby 2.2.

This will slim down the now-extensive travis
suite matrix and speed it up.

The next tests to trim out will be Rails 3.1
with Ruby 2.2.

.travis.yml

@@ -45,6 +45,13 @@ matrix:
       env: RAILS=master DB=mysql
     - rvm: 2.2
       env: RAILS=master DB=postgres
+  exclude:
+    - rvm: 2.2
+      env: RAILS=3-0-stable DB=sqlite
+    - rvm: 2.2
+      env: RAILS=3-0-stable DB=mysql
+    - rvm: 2.2
+      env: RAILS=3-0-stable DB=postgres
 
   allow_failures:
     - env: RAILS=master DB=sqlite3
@@ -63,12 +70,6 @@ matrix:
       env: RAILS=3-1-stable DB=mysql
     - rvm: 2.2
       env: RAILS=3-1-stable DB=postgres
-    - rvm: 2.2
-      env: RAILS=3-0-stable DB=sqlite
-    - rvm: 2.2
-      env: RAILS=3-0-stable DB=mysql
-    - rvm: 2.2
-      env: RAILS=3-0-stable DB=postgres
 
 before_script:
   - mysql -e 'create database ransack collate utf8_general_ci;'

spec/ransack/dependencies_spec.rb

@@ -1,12 +1,10 @@
-ruby, rails  = RUBY_VERSION, ::ActiveRecord::VERSION::STRING.first(3)
-
-if %w(3.2 4.0 4.1).include?(rails) || (%w(3.0 3.1).include?(rails) && ruby < '2.2')
+rails = ::ActiveRecord::VERSION::STRING.first(3)
 
+if %w(3.2 4.0 4.1).include?(rails) || rails == '3.1' && RUBY_VERSION < '2.2'
   describe 'Ransack' do
     it 'can be required without errors' do
       output = `bundle exec ruby -e "require 'ransack'" 2>&1`
       expect(output).to be_empty
     end
   end
-
 end