Add disableWriterAheadLogging() on Nook HD Plus.

The Nook HD Plus seems to have trouble without calling this hidden API.
This should fix users of this device. Further testing is required to
know if the same fix is required on other versions of Nook as well.
Merge pull request #136 from flerda/v2.0.2-nook

Add disableWriterAheadLogging() on Nook HD Plus.