Performance improvement to mii_rx_pins
Adding board support for D4U module
Remove ETHERNET_TX_NO_BUFFERING option.

    This option was experimental and doesn't seem to meeting timing
    requirements. It is not a documented/supported option and it
    seems better to remove it entirely than have something potentially
    broken.
Merge pull request #48 from davelxmos/remove_buffering

Remove ETHERNET_TX_NO_BUFFERING option.
Improve mii tx crc timings.

   This commit changes the transmission of the crc at the end of the mii
   transmit to improve perfomance.
Merge branch 'rx_performance_fix' of git://github.com/davelxmos/sc_ethernet
Optimize inter packet MII rx code
Eliminate build warning
Update CHANGELOG and meta information.
Update eclipse metainfo
'Release: 2.2.4rc0'
Merge branch 'master' into slave. Changes for v13 tools.

Conflicts:
	module_ethernet/src/full/ethernet_tx_server.xc
	module_ethernet/src/full/mii.xc
	module_ethernet/src/full/mii_wrappers.c
	module_ethernet/src/full/mii_wrappers.h