Added copy of up_enc28j60.c.
Added pin mapping.
Configure SPI pins and add device to select function.
Made up_enc28j60.c part of build.
Changed the location where CS pin for the ENC is defined.
Added readme file with possible SPI pins and mapping of alternate functions.
Added program script.
Moved ENC from SPI5 to SPI4.
Moved CS (to SPI4_NSS), RESET and INT pins.
Added copy of up_enc28j60.c.
Added pin mapping.
Configure SPI pins and add device to select function.
Made up_enc28j60.c part of build.
Changed the location where CS pin for the ENC is defined.
Added readme file with possible SPI pins and mapping of alternate functions.
Added program script.
Moved ENC from SPI5 to SPI4.
Added TODO comment.
Merge branch 'enc28j60' of ssh://labs.lazlo.de:2200/home/lazlo/scm/git/nuttx into enc28j60

Conflicts:
	nuttx/configs/stm32f429i-disco/include/board.h
	nuttx/configs/stm32f429i-disco/src/stm32f429i-disco.h
	nuttx/configs/stm32f429i-disco/src/up_enc28j60.c
Added new stm32f429i-disco config nettest based on the nsh config.