It is enabled by default for dev build. It will be used for reworking
the Tango theme by the design team.

The them was requested by Stefan Knorr (Astron) <heinzlesspam at gmail dot com>
The two intial icons are from Alexander Wilms <alexander dot wilms at zoho dot com>

Change-Id: I9205a3164352442a2cdc02e75e58b15b327dfbd3