NDK libs now in libs/armbeabi
Deleting unused symbolic links in assets/
Updating symbolic links in assets/ for new ndk
Update build process and documentation

Update the build process by ensuring that all
variables are set before ant will build an image.

Document the build process in external/Makefile
and README with information about how to build by
hand and using ant.

This closes commotion-android issue #21.
Use Commotion error icon

Replace the leftover Barnacle error icon with
a Commotion error icon.
Do not put empty Profile values into environment
Pass optional interface_name to OlsrdService
Add fallbackInterfaceName member variable to OlsrdControl
Use fallbackInterfaceName (interface_name) if provided and if necessary