Adding support for rails4
Removing ree and adding support for rails4gemfile
Supporting ActiveRecord::VERSION::MAJOR <= 4
Excluding ruby 2.1 for rails4
Adding protected_attributes gem for Rails4
Adding back ree
Adding ree rails4 to exclusion matrix
Getting rid of ActiveRecord version checks as attr_accessible is available everywhere
Changes as per PR comments
Rails 4.0
Merge pull request #36 from zendesk/prudhvi/rails4

Adding support for rails4