Generators do not run in Rails 3.2

[justin808]

@flynfish reported:

I'm running 3.2 and trying to run the generators it fails because of the hide! method:

[WARNING] Could not load generator "generators/react_on_rails/base_generator". Error: undefined method `hide!' for ReactOnRails::Generators::BaseGenerator:Class

A work around would be to copy/paste from these examples: https://github.com/shakacode/react_on_rails-generator-results

The runtime support for 3.2 is more important than the generator.

[flynfish]

PR #165 submitted

[flynfish]

I closed out PR #165 and submitted #182 as a better solution