make buildtest more readable
decolorize buildtest output for jenkins/monochrome
make buildtest fail on error
Merge pull request #620 from LudwigOrtmann/buildtest_fail

upgrade buildtest for CI
Fix types in transceiver.c
Merge pull request #631 from authmillenon/fix-transceiver-types

Fix types in transceiver.c
model uart dependency on posix
remove trailing newlines
remove superfluous uart USEMODULEs from examples
remove superfluous uart USEMODULEs from test
update test_shell/ReadMe.txt
Merge pull request #634 from LudwigOrtmann/uart_posix_dep

uart related cleanup
Add quadword math lib

GCC implicitly calls functions like __adddi3 to handle arithmetics on
long long.

Copied from http://ftp3.usa.openbsd.org/pub/OpenBSD/src/lib/libc/quad/
which is curtesy of the OpenBSD project (3 clause BSD license).
Add compile time checks to quad.h