add test for protected attributes
get attributes method name from options and stash it as a symbol
Fallback to legacy behavior if no attributes method specified
make sure params_method is always set, either to the value passed in or to guessed default
cant check respond_to for a private method, rescue of params_method does not exist and run legacy method
Merge pull request #1 from Tukaiz/support_rails_4_protected_attributes

Support rails 4 protected attributes