crypto: get rid of compiler warnings
tests: let license checker check headers, too
make: Add target to show if boards that are supported by apps
[SQUASH ME] make: move info-boards-supported to Makefile.buildtests
make: Add info prefix for non-building targets in Makefile.buildtests
[SQUASH ME] make: Add info prefix for non-building targets in Makefile.buildtests
changed parameters form `kernel_pid_t` to `int`
pthread: pthread_barrier should call yield
tests: clean up test_pthread_barrier Makefile
core: shadowing in priority_queue_print

The variable `node` shadows the parameter `node`. The access of
`node->first` would not compile, because there is no member `first` in
`priority_queue_t`.
Merge pull request #1563 from Kijewski/priority_queue_print-typo

core: shadowing in priority_queue_print
[SQUASH ME] Fix some error + simplify some calls
Merge pull request #1522 from OlegHahm/crypto_cleanup

crypto: get rid of compiler warnings
drivers/at86rf231: add transceiver/pid includes
Merge pull request #1567 from LudwigOrtmann/at86rf231_includes

drivers/at86rf231: add transceiver/pid includes
pyterm: Use only printf-style String Formatting

Needed for backwards compatibility to python 2.6. Refers to
https://github.com/RIOT-OS/RIOT/commit/46c38230ebb7cbc690ac77d1b649e29c536f1d0c#commitcomment-7363298
Merge pull request #1568 from authmillenon/pyterm-printf-style

pyterm: Use only printf-style String Formatting
pyterm: adds timer function

/timer <interval> <command> now allows to schedule arbitrary commands to
be send to the node after the specified interval (in seconds).
Merge pull request #1569 from OlegHahm/pyterm_timer

pyterm: adds timer function
make: don't call mkdir -p a lot