add oonf_api pkg
moved debugging statements from header to c file

Additionally, declaring the stacks as static.
amendment - to be squashed
tests: add test that shows sequence of received messages
test_thread_msg_seq: add missing main() return statement
core:mutex: allow idle thread to use mutexes
Add test if the message queue is fair
use cpu dependent stack size
apply channel mask when setting the channel
Fix address output of net_if shell command
Merge pull request #868 from OlegHahm/at86rf_channel

apply channel mask when setting the channel
Disable debug output for at86rf231 driver
Merge pull request #871 from authmillenon/at86rf231-debug-output

at86rf231: Disable debug output for at86rf231 driver
Merge pull request #869 from authmillenon/net-if-shell

sys:net:net_if: Fix address output of net_if shell command
fix ignore command
use forwarding table entry when routing

So far the entry was looked up, but ignored in the case where the packet
has to be forwarded.
added missing hdr position shift
Change reboot signature.

Change from `void reboot(void)` to `int reboot(int mode)`.
Move reboot definition to core, rename architecture implementations
from reboot to reboot_arch.
Declare reboot mode(s) in kernel.h, reboot_arch in kernel_internal.h
Currently only one reboot mode is handled, its use is enforced.

Rationale:
A reboot function is already defined in <unistd.h> on BSD systems.
(See: http://www.openbsd.org/cgi-bin/man.cgi?query=reboot&sektion=2)
This patch not only allows native to build sensibly on these systems
but also streamlines RIOTs compatability with existing software.
shell: accept UTF8 input
shell: don't ignore IO errors