also make the RIOT_VERSION variable available in buildtest

doc: some more author fixes

fix all occurences of INRIA as an author
correct Oliver Hahms authorship and indentation

doc: fix all occurences of FU as author

.. but only if there are other authors as well

native: increase rtc realism

boards/chronos: clean up display driver a bit

doc:   #1440 follow up

- a university is not an author
- move internal tags to the right place

core: simplify mutex signatures

sys: Add generic pipe

ringbuffer: versatility and optimizations

There is no need for an explicit pointer to the end of the buffer.

It is a bad idea to use signed types for lengths.
Mark pointers a `restrict`, since the ringbuffer is not thread safe
anyway.

This patch add `peek` functionality, and empty and full helpers.

drivers: some improvements to the ADC driver interface

board - arduino-due: some cleanup

- removed unused defines

- added parenthesis for LED macros
- changed mapping for LED_* to LED_RED_*
- removed some old values from periph_conf.h

- removed UNDEFINED value from device enum
- added pre-defined precision values
- added power[on|off] functions
- some minor doxygen fixes

Reset ARM Cortex-M3 MCUs before flashing

drivers: added servo motor driver

Prevent rtc enabling when not initialized.

sys/transcevier: fix more loop integers

native: uart reconnect buffer replay (+a little cleanup)

fix style
fix some syscall declarations
reorder syscall declarations
init syscalls in dedicated function
substitute 1 with EXIT_FAILURE

When using socket stdio, add option to replay what has been written to
stdout while not connected (`-r`).

The implementation is to simply use the existing log file (which is
implicitly created when the option is used), and read from it until
EOF upon reconnect.

closes #476

reduce scope of variables
remove useless comments and spaces

saves 2 bytes =)

Fix a few cppcheck findings