Pluralizing the word 'gas'

Hi!

I've been working on an Ember Project (EmberCLI 1.13.8, Ember 2.0, Ember Data 2.0), and I've created a model 'gas'.

When using ember-data to query the store. `this.store.query('gas')` the url that's built is `/api/gas`instead of what I expected, which would be `/api/gases`. I've created a custom adapter to deal with the situation, but I think this might be a problem with the ember-inflector.

I've created an [Ember Twiddle to show the issue](http://ember-twiddle.com/693a61eed139ab8f8d56)

Any thoughts? Thanks for the project!

Start by reproducing the `this.store.query('gas')` case from the linked Ember Twiddle and inspect how ember-inflector derives the `/api/gas` URL. Done means the inflector produces the expected plural form `/api/gases` without requiring the custom adapter described in the report.

Written by the indexing model from the issue text.