Use <add-resource> in framework overlays

Not using <add-resource> causes aapt to complain and stop compilation of
resources.

Change-Id: I843c478375a610070f35bf4223496d9f09844d2c
Disable automatic brightness control

The Nook Color does not have a sensor useable to determine
brightness automatically.

Change-Id: I66efa9c6343660a24fce1013084e5dcd19429da2
Define config_deviceHardwareKeys with the home button

The Nook Color has a home button, make the framework aware of it.

Change-Id: I93af0578ab28724cfbabf880197037d87d69daf8
Define ro.config.low_ram=true

This is recommended now for Android 4.4 (KitKat) for devices
which have 512MB of RAM or less. The Nook Color clearly belongs
to this category.

Change-Id: Ia96d8773fc265a2b2a8df14787d4d27f5f924df7