adding files for iceowl build
iceowl: adding branding source directory

As Iceowl is the rebranded Sunbird suite inside Debian we need to adopt
the branding releated files from the old Iceowl packaging repository.
Depending on some new binary files for Iceowl theese files has to be
announced into debian/source/include-binaries.
iceowl: adding a mozconfig file for building Iceowl

The out of tree build needs a mozconfig file. As allready done for
Icedove create a own mozconfig file for Iceowl. The entrys for this file
are taken from the old Iceowl repository.
temporary changing the debin/rules files

This commit has to be changed!!!
Currently only the Iceowl will starting to build!