[Notification] Use forceSetProperty to permit true readonly values
Merge pull request #151 from cmarcelo/notification-use-v8tools

[Notification] Use forceSetProperty to permit true readonly values
bluetooth: Add a simple workaround for setPowered()

When the adapter is already powered we may just call the callback.

This is just a temporary solution until there is a proper solution for
the problem of the adapter exiting the USB bus, when it is powered down.