core/net/uip.h: Add missing #include <string.h>

Fixes implicit definition of memcmp() warnings/errors.

Signed-off-by: Joakim Gebart <joakim.gebart@eistec.se>
Changed the parameter 'char * data' of process_start to the
type process_data_t. This was an artifact when the choice was
made to use the void * type for the data parameter in processes.

Changed parameter 'void * data' of process_post_synch to
process_data_t for consistency.

Checked all the uses of process_start() in contiki and fixed casts
of the data parameter.
Update README.md

Adding new command for ftdi_sio which applies to Kernel>3.12 used by Ubuntu 14.04 LTS
Removing trailing whitespaces
Merge pull request #711 from gebart/upstream-fix-implicit-definitions

uip.h missing #include <string.h>
Adding a CONTRIBUTING file to use github feature

https://github.com/blog/1184-contributing-guidelines
Merges Z1SP into Z1 platform
Only wait for a keypress if the user is told to press a key.
Merge pull request #747 from oliverschmidt/master

Only wait for a keypress if the user is told to press a key.
Merge pull request #739 from alignan/merge_z1sp_with_z1

Merges Z1SP into Z1 platform
Clean up script commands in .travis.yml.

Besides general whitespace and quoting cleanup, commands that test
variables were changed from:
  [ $B = a ] && command || true
to
  if [ $B = a ] ; then command ; fi
This form correctly returns the exit code of "command".
Add retries to commands that download from external servers.

This helps reduce the chance of a build failure due to transient
download error.  This also switches to consistent use of wget
throughout, which reports download errors more cleanly in the travis
build logs.
Rename travis "arm" BUILD_ARCH to "arm-apcs".

These platforms are built with an old ARM compiler that supports the
deprecated APCS standard.
Increase fixed filename sizes in SLIP tunnels

Long serial port names like
  /dev/serial/by-id/usb-FTDI_FT230X_Basic_UART_DN0038W8-if00-port0
cause crashes.  This is the simplest fix to avoid the problem.
Merge pull request #748 from jimparis/travis-cleanup

Travis cleanup
Merge pull request #737 from jimparis/slip-buffer-overflow-fixes

Increase fixed filename sizes in SLIP tunnels
Fixed hardware detection.

The previous chip detection was inspired by the old IP65 driver code. For some reason it didn't work as expected. The new code is simpler and based on this statement in the chip datasheet: "The upper byte always reads as 33h and can be used to help determine the I/O location of the LAN91C96."
Merge pull request #750 from oliverschmidt/master

Fixed hardware detection.
Add missing semi-colon
Merge pull request #753 from kartben/patch-1

Add missing semi-colon