Add a torii adapter for firebase

Why:

* It would be great to use firebase authentication more easily.

This Commit:

* Merges the [torii-fire] addon into emberfire
* This adds a torii adapter for firebase

[torii-fire]: https://github.com/MattMSumner/torii-fire

addon/torii-providers/firebase.js

@@ -0,0 +1,20 @@
+import Ember from "ember";
+
+export default Ember.Object.extend({
+  firebased: Ember.inject.service(),
+  firebase: Ember.computed.alias('firebased.firebase'),
+
+  open: function(options) {
+    var self = this;
+
+    return new Ember.RSVP.Promise(function(resolve, reject) {
+      self.get("firebase").authWithOAuthPopup(options.authWith, function(error, authData) {
+        if (error) {
+          reject(error);
+        } else {
+          resolve(authData);
+        }
+      });
+    });
+  }
+});

app/torii-providers/firebase.js

@@ -0,0 +1,3 @@
+import FirebaseProvider from 'emberfire/torii-providers/firebase';
+
+export default FirebaseProvider;

tests/unit/torii-providers/firebase-test.js

@@ -0,0 +1,44 @@
+import Ember from 'ember';
+import { describeModule, it } from 'ember-mocha';
+import sinon from 'sinon';
+
+describeModule('torii-provider:firebase', 'FirebaseProvider', {
+  needs: ['service:firebased'],
+}, function() {
+
+  describe('#open', function() {
+    it('errors when firebase.authWithOAuthPopup errors', function() {
+      let provider = this.subject();
+      let errorMock = sinon.spy();
+      const firebaseMock = {
+        authWithOAuthPopup: sinon.stub().yields(errorMock)
+      };
+      provider.set('firebase', firebaseMock);
+
+      Ember.run(function() {
+        provider.open({authWith: 'errorProvider'}).catch(function(error) {
+          assert.ok(firebaseMock.authWithOAuthPopup.calledWith('errorProvider'));
+
+          assert.equal(error, errorMock);
+        });
+      });
+    });
+
+    it('returns authData when firebase.authWithOAuthPopup returns authData', function() {
+      let provider = this.subject();
+      let authDataMock = sinon.spy();
+      const firebaseMock = {
+        authWithOAuthPopup: sinon.stub().yields(null, authDataMock)
+      };
+      provider.set('firebase', firebaseMock);
+
+      Ember.run(function() {
+        provider.open({authWith: 'successProvider'}).then(function(authData) {
+          assert.ok(firebaseMock.authWithOAuthPopup.calledWith('successProvider'));
+
+          assert.equal(authData, authDataMock);
+        });
+      });
+    });
+  });
+});