Rip out the remainder of Bluebird

src/settings/handlers/DeviceSettingsHandler.js

@@ -15,7 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import Promise from 'bluebird';
 import SettingsHandler from "./SettingsHandler";
 import MatrixClientPeg from "../../MatrixClientPeg";
 import {SettingLevel} from "../SettingsStore";

src/settings/handlers/LocalEchoWrapper.js

@@ -15,7 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import Promise from "bluebird";
 import SettingsHandler from "./SettingsHandler";
 
 /**

src/settings/handlers/RoomDeviceSettingsHandler.js

@@ -15,7 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import Promise from 'bluebird';
 import SettingsHandler from "./SettingsHandler";
 import {SettingLevel} from "../SettingsStore";
 

src/settings/handlers/SettingsHandler.js

@@ -15,8 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import Promise from "bluebird";
-
 /**
  * Represents the base class for all level handlers. This class performs no logic
  * and should be overridden.