chore(package): bump to alpha.13

chore: bump to alpha.12

chore(package): bump to alpha.11

chore: bump to alpha.10

chore(package): bump version to alpha.9

Included in this release:
 * Upgrade to Angular2 beta.7, rxjs 5 beta.2, zone.js 0.15.5, and Firebase 2.4.1
 * Remove FirebaseList provider-based API (in favor of AngularFire service)
 * Automatically unwrap values in list returned from AngularFire.list()

chore: bump to alpha.8

chore: rename main module from angularfire to angularfire2

chore(package): bump self version and angular,firebase versions

Two tests needed to be commented out until some upstream fixes land
in angular/angular (#6928)

chore: bump version to alpha.5

chore: release alpha.4