dzen2: Add recipe for dzen2, a small messaging/menu program.

dzen2: Add recipe for dzen2, a small messaging/menu program.

* Added Makefile, which adds the INCS and LIBS variables due to the
  way OE handles CFLAGS and LDFLAGS.

* Added dzen-extras.tar.gz which adds a launcher script containing
  several functions (including time display, memory usage, cpu usage
  and battery status) for use of dzen as a panel application, along
  with some other required scripts and images.

Signed-off-by: Alex Ferguson <thoughtmonster@gmail.com>
Signed-off-by: Kristoffer Ericson <kristoffer.ericson@gmail.com>