Fixes #1104, alternative to #1178.

test:test_vtimer fixed initializer and Wformat warnings

Native license unification

 sys/ping/ping.c: malloc size of type, not size of pointer

unittests: Unittests for core module data strutures

msp430: fix missing members in `struct tm`

native: initialize maybe uninitialized variable

Fix doxygen comments for hwtimer.h, queue.h and io.h

Native minifix

board: Initial import of the UDOO board

blacklisted for:
- ccn-lite-client
- ccn-lite-relay
- rpl_udp
- test_net_if
- test_pnet

core: improved doxygen documentation

- fixed comment style and bracketing
- disabled newlib nano, added mac support
- fixed OSX compatibility in Makefile.include

github: added CONTRIBUTING.md

improved files complient to issue #950
- thread.h
- flags.h
- debug.h
- crash.h

boards: fix license headers to LGPL

harmonises license headers in msb-430, msba2-common,
msba2 and wsn430-common

fixes #1160

fixes #1118

make: Remove `Makefile.unsupported`

native: net: OSX: Fix rpl_udp example

make: Make make more flexible

doc: Exclude *.c files from make doc

This mechanism was replaced by #535. It was only used in one project.

Closes #1150.

undefine macros and reorder header includes to get rid of system
defined macros on OS X

fixes #1165