clean up of ifdefs in transceiver module
fix for #117 and position of preprocessor directives
some debug enhancements
removing residual breaks in switch-case statements due to #ifdefs
removed unused (and ambiguous) definitions of active_thread and sched_threads in kernel_init.c
moved prototype for sched_register_cb() from C file to header
Merge pull request #118 from OlegHahm/transceiver_cleanup

Transceiver cleanup
added documentation for sched.h
re-added the scheduler callback (the actual call was missing)
Merge pull request #134 from OlegHahm/sched_fixes

Scheduler callback
native cc1100x_ng network via tap

not properly passing received data to transceiver atm
native cc1100 write commands
moved code around
wip
pkt reception working (probably)
reception working as intended
enable error messages in tap
Generalized, improved and renamed tap setup script
add native README, explicate startup fail msg
osx support for tap