travis updates and gemfile test for travis

.travis.yml

@@ -2,7 +2,7 @@ language: ruby
 before_script:
   - cd tests/test_app
   - bundle exec rails g impressionist -f
-  - bundle exec rake db:migrate
+  - bundle exec rake db:create db:migrate RAILS_ENV=test
   - cd ..
 rvm:
   - 1.9.3

gemfiles/rails32.gemfile

@@ -22,6 +22,9 @@ group :test do
   gem 'simplecov'
   gem 'systemu'
   gem 'friendly_id', '~> 4.0.9'
+
+  # test/unit has been removed by default in Ruby 2.2.x+
+  gem 'test-unit'
 end
 
 gemspec :path => '../'

gemfiles/rails40.gemfile

@@ -22,6 +22,9 @@ group :test do
   gem 'simplecov'
   gem 'systemu'
   gem 'friendly_id', '~> 5.1.0'
+
+  # test/unit has been removed by default in Ruby 2.2.x+
+  gem 'test-unit'
 end
 
 gemspec :path => '../'