Support versions of rails before 4.0

[jonathan]

Rails 4 introduced before_action in the controllers but still supports before_filters. It'd be nice if before_filter was used in the controller helper at least until they become deprecated so people still using rails 3.2 can use this lib.

[benoist]

I agree.
I'll fix this tomorrow.

[jlurena]

This is still an issue. I get

Bundler could not find compatible versions for gem "activemodel":
  In snapshot (Gemfile.lock):
    activemodel (= 3.2.22.10)

  In Gemfile:
    rails3_acts_as_paranoid was resolved to 0.1.1, which depends on
      activerecord (>= 3.0.9) was resolved to 3.2.22.10, which depends on
        activemodel (= 3.2.22.10)

    libsaml (= 3.3.0) was resolved to 3.3.0, which depends on
      activemodel (>= 4.2)

Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.