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
Sender rank in Hop-by-Hop option has inverted bytes
Setting uip_ext_len again breaks hop-by-hop option
Insert properly Hop-by-Hop option at first hop
Improve RPL hop-by-hop option detection
Merge pull request #650 from cetic/pr-rpl-hbh-fixes

Fix for RPL Hop-by-Hop options
rl78: Change RIMEADDR_CONF_SIZE to LINKADDR_CONF_SIZE because the rimeaddr module has been renamed to linkaddr.
Merge pull request #734 from hexluthor/rl78-linkaddr

rl78: Change RIMEADDR_CONF_SIZE to LINKADDR_CONF_SIZE
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.