Debianise arduino-ethernet-enc28j60

Signed-off-by: Olivier Mehani <shtrom@ssji.net>
Updated examples to use current Ethernet(Client|Server) classes

Signed-off-by: Olivier Mehani <shtrom@ssji.net>
Replace obsolescent prog_char for PROGMEM

This is needed with avr-gcc>=1.8 [0].

[0] http://www.tuxgraphics.org/electronics/201207/prog_char.shtml

Signed-off-by: Olivier Mehani <shtrom@ssji.net>