[SQUASH ME] net_dev adapt interface for ISR events
[SQUASH ME] adapt net_dev_802154 for ISR events
[SQUASH ME] Adapt nativenet for handling of ISR events
[SQUASH ME] Adapt net_dev_dummy for handling of ISR events
[SQUASH ME] Test handling of ISR events for net_dev_dummy
sys: net: Initial import of a general interface to a network protocol
sys: net: Initial import of a dummy MAC protocol layer
sys: transceiver: Provide an adapter to basic_net module

Since basic_net is aimed to replace tranceiver one day, but porting
efforts usally take a while, this commit aims to provide access via
transceiver as we are used to for radio/network drivers that already implement
basic_net (e. g. uart_net in #1454).
basic_net: dummy_mac: Add capability to fire events with net_dev_dummy
unittests: provide unittests dummy_mac
tests: transceiver: basic_net: nativenet: Provide transceiver adapter tests
msp-430: fix linking for msp-430 boards

* see http://permalink.gmane.org/gmane.os.contiki.devel/13870
[SQUASH ME] dummy_mac: catch ISR events from driver and hand them back
[SQUASH ME] unittests: dummy_mac: test ISR event catching