travis integration refactoring

add dummy app for test cases
test 2.3 integration
fix path for test_help.rb
Update gemfiles/2.3.gemfile
Update test/test_helper.rb
Update gemfiles/2.3.gemfile
Update Rakefile
Update test/functional/wicked_pdf_helper_test.rb
rails-edge integration
rails edge fix

rails edge only supports 1.9.3 ruby
fix wrong build matrix
rails 4 only supports ruby 1.9.3+
wrong matrix