Upgrade dummy app Gemfile to Rails 4
remove attr_accessible from Role model
Updgrade Role controller behavior to use Rails 4 parameter permit methods.
Include RoleManagement engine routes in each controller spec because spec_helper loading seemingly not working
Parameterize Rails version using ENV["RAILS_VERSION"].  Also amend Rakefile to build test app in spec/internal using the environment variable and gemfile_stub
Add attr_accessible through initializer file only if using a version of rails that does not permit StrongParameters.  Also use Rails 4 params.permit if StrongParameters is supported
Add some descriptions and condiditonals to installation generator
Update README for information on how to test with Rails 4 support.
Add some documentation
Add upstream changes
Add some documentation

Updating CONTRIBUTING.md as per Hydra v6.0.0

[ci skip]
Merge branch 'rails4_support' of https://github.com/acurley/hydra-role-management into rails4_support
Delete unnecessary spec/support/Gemfile as per @jcoyne suggestion
Improve Rakefile clarity and remove unnecessary generator step
Improve clarify of gem requirements
Merge branch 'master' into rails4_support

* master:
  Improve clarify of gem requirements
  Improve Rakefile clarity and remove unnecessary generator step
  Delete unnecessary spec/support/Gemfile as per @jcoyne suggestion
Two minor stylistic fixes requested by @jcoyne
Merge pull request #6 from acurley/rails4_support

Rails4 support