Update to Firebase 1.1.0

Tests are all green after updating to Firebase 1.1.0!

```
Running "mocha_phantomjs:phantom" (mocha_phantomjs) task
DEBUG: -------------------------------
DEBUG: Ember      : 1.7.0
DEBUG: Ember Data : 1.0.0-beta.8.2a68c63a
DEBUG: EmberFire  : 0.0.0
DEBUG: Handlebars : 1.3.0
DEBUG: jQuery     : 2.1.1
DEBUG: -------------------------------


  FirebaseAdapter
    #init()
      ✓ has a Firebase ref
    #_getRef()
      ✓ returns the correct Firebase ref for a type
      ✓ returns the correct Firebase ref for a type and id
    #_queueScheduleFlush()
      ✓ schedules a #_queueFlush()
    #_enqueue()
      ✓ pushes a new item into the _queue
      ✓ schedules a _queueFlush()
      ✓ flushes the _queue
      ✓ applys the callback with the correct arguments
    #find()
      ✓ creates a single Firebase reference
      ✓ creates the correct Firebase reference
      ✓ returns an object
      ✓ returns a promise
      ✓ resolves with the correct payload
      ✓ throws an error for records that don't exist
    #findAll()
      ✓ creates a single Firebase reference
      ✓ creates the correct Firebase reference
      ✓ returns an object
      ✓ returns a promise
      ✓ resolves with the correct payload
      ✓ adds new child values to the store (45ms)
      ✓ handles empty collections
    #updateRecord()
      normalized relationship
        ✓ created the correct Firebase reference
        ✓ contains a hasMany relationship
        ✓ removed the hasMany relationship from the final payload
        ✓ contains a null belongsTo relationship
        ✓ removed the null belongsTo reference from the final payload
        ✓ created the correct relationship Firebase reference
        ✓ saved each related record
      multiple normalized relationships
        ✓ adds a comment without removing old posts (55ms)
      denormalized relationship
        ✓ created the correct Firebase reference
        ✓ contains a hasMany relationship
        ✓ removed the hasMany relationship from the final payload
        ✓ created the correct relationship Firebase reference
        ✓ saved each related record
        ✓ saved the related record by serialization

  FirebaseSerializer
    #normalize()
      normalized payload
        ✓ converts hasMany relationships to arrays
      denormalized payload
        ✓ leaves embedded hasMany relationships as objects
      invalid payload
        ✓ throws an error for hasMany relationships that come down as an array
    #extractSingle()
      normalized payload
        ✓ was called for each item in the payload
      denormalized payload
        ✓ was called for each item in the payload
        ✓ pushed the embedded records into the store
    #extractArray()
      normalized payload
        ✓ was called once
        ✓ returns an array
        ✓ the returned array contains the correct number of items


  ✔ 44 tests complete (4.374 seconds)


Done, without errors.
```