added test application for nativenet transceiver
added sender target to Makefile
make use of the nativenet source address (as introduced in #170)
stack for shell thread was too small
Updated test shell project and added readme
Merge pull request #25 from OlegHahm/test_nativenet

added test application for nativenet transceiver
Merge pull request #35 from OlegHahm/test_cc110x_ng_stack

stack for shell thread was too small