specs use rspec2 specific methods
not using 'hashie/extension'

We're not using that module in this file anyway, and since hashie
refactored that file away as part of V 3 release, this require was
blowing up.
update deprecated rspec syntax
now works with spec 3
fix deprecation: treat_symbols_as_metadata_keys_with_true_values now defaults to true
fix rspec3 deprecation: failure_message_for_should -> failure_message
Merge pull request #11 from michaelkirk/compatible_with_hashie_3

Compatible with hashie 3