On Travis, restrict Cucumber tests to MySQL builds

lib/tasks/continuous_integration.rake

@@ -1,15 +1,32 @@
-task :ci do |t|
-  ENV['RAILS_ENV']  ||= "test"
+namespace :ci do
+  desc 'Continuous integration tests, without features'
+  task :lite do
+    ENV['RAILS_ENV']  ||= "test"
 
-  # test coverage from codeclimate
-  require "codeclimate-test-reporter"
-  CodeClimate::TestReporter.start
+    puts 'Running "lite" test suite'
 
-  # local test coverage
-  require 'simplecov'
-  SimpleCov.start 'rails'
+    [:environment, 'db:create', 'test:all'].each do |t|
+      Rake::Task[t].invoke
+    end
+  end
 
-  [:environment, 'db:create', 'test:all', 'cucumber'].each do |t|
-    Rake::Task[t].invoke
+  desc 'Continuous integration tests, including features'
+  task :full do |t|
+    puts 'Running full test suite'
+
+    # test coverage from codeclimate
+    require "codeclimate-test-reporter"
+    CodeClimate::TestReporter.start
+
+    # local test coverage
+    require 'simplecov'
+    SimpleCov.start 'rails'
+
+    ['ci:lite', 'cucumber'].each do |t|
+      Rake::Task[t].invoke
+    end
   end
 end
+
+desc 'Alias for ci:full'
+task :ci => 'ci:full'