cpu/avr/radio/rf230bb/rf230bb.c (rf230_transmit): extend comment on tx sequence

Explain that the transmission is intentionally started before copying the
frame to the buffer.
Merge pull request #311 from oliverschmidt/master

Be consistent with tab chars in Makefiles - yet again...
Merge pull request #312 from oliverschmidt/master

Be consistent with tab chars in Makefiles.
Merge pull request #313 from oliverschmidt/master

unistd.h doesn't seem to be necessary but breaks the MS VC build.
Merge pull request #314 from oliverschmidt/master

Recent changes in telnetd make exporting of those two necessary.
Merge pull request #315 from oliverschmidt/master

Support the recently added verbosity control.
Merge pull request #316 from oliverschmidt/master

Suppress some usual warnings.
Merge pull request #317 from oliverschmidt/master

Several minor consistency improvements.
Merge pull request #304 from frtos-wpan/rf230bb-merged

cpu/avr/radio/rf230bb/rf230bb.c (rf230_transmit): extend comment on tx s...
Update travis to use a newer SDCC

Due to SDCC bug #1986, we were previously stuck
with SDCC revision #7100. The bug was fixed with
rev #8719. Thus, we can now use newer versions

More info: http://sourceforge.net/p/sdcc/bugs/1986/
Merge pull request #319 from g-oikonomou/travis-new-sdcc

Update travis to use a newer SDCC
Switch to mspgcc 4.7.0
Updated mspsim.jar

The Contiki source code holds a binary version of mspsim.jar until
we get a proper git submodule set up. This particular version of mspsim.jar
is built from Thingsquare's mspsim fork.
Added mspgcc 4.7.x flags
Filter out symbols defined by the C implementation
Parse rodata too
Allow the exit code from a failed test script to propagate to the Java
process, which makes it possible to track failing tests in makefiles and
via scripts.
Turn off the LCD by default as it is somewhat flaky
Add CC2538 travis compile tests
Merge pull request #320 from g-oikonomou/travis-cc2538

Add CC2538 travis compile tests