adding Rails 5.0.0.beta4 to Travis builds

.travis.yml

@@ -25,6 +25,7 @@ gemfile:
   - gemfiles/rails_4.2.gemfile
   - gemfiles/rails_4.2_mongoid_5.gemfile
   - gemfiles/rails_4.2_mongo_mapper.gemfile
+  - gemfiles/rails_5.0.gemfile
 
 before_script:
   - mkdir /tmp/dynamodb
@@ -36,9 +37,12 @@ matrix:
     - rvm: rbx-2.2.1
     - rvm: jruby-1.7
     - rvm: 2.3
+    - gemfile: gemfiles/rails_5.0.gemfile
   exclude:
     - rvm: 1.9.3
-      gemfile: gemfiles/rails_4.1.gemfile
+      gemfile:
+        - gemfiles/rails_4.1.gemfile
+        - gemfiles/rails_5.0.gemfile
     - rvm: 2.2
       gemfile: gemfiles/rails_3.2_stable.gemfile
     - rvm: 2.3

gemfiles/rails_5.0.gemfile

@@ -0,0 +1,15 @@
+source "https://rubygems.org"
+
+gem "sqlite3",                          :platforms => :ruby
+gem 'rubysl',                           :platforms => :rbx
+gem 'rubinius-developer_tools',         :platforms => :rbx
+gem "jruby-openssl",                    :platforms => :jruby
+gem "activerecord-jdbcsqlite3-adapter", :platforms => :jruby
+gem "mime-types", "~> 2" if Gem::Version.create(RUBY_VERSION.dup) <= Gem::Version.create('1.9.3')
+gem "rails", "5.0.0.beta4"
+gem 'mongoid', '~>4.0' if Gem::Version.create(RUBY_VERSION.dup) >= Gem::Version.create('1.9.3')
+gem 'sequel'
+gem 'dynamoid', '~> 1',                 :platforms => :ruby
+gem 'aws-sdk', '~>2',                   :platforms => :ruby
+
+gemspec :path => "../"