Upgrade to Rails 4

+Update Rails to 4.0.0, and update all gems to latest
+Remove assets group from Gemfile
+Remove strong_parameters gem, and ForbiddenAttributesProtection from models
+Update scope to use lambda
+Remove loading of ActiveResource
+Add explicit format to controller specs
+Remove config.whiny_nils, config.active_record.whitelist_attributes, and config.active_record.mass_assignment_sanitizer
+Add config.eager_load and config.secret_key_base
Add new Rails /bin executables