Added a way to get the RSSI of the last received packet
If the 6lowpan layer is currently reassembling a packet, and a non-fragmented packet comes along, this is a sign that one of the fragments were lost (as they normally would arrive back-to-back, in sequence). So we'll grab the non-fragmented packet instead of dropping it.
Removed old, unused msp430-based platforms
Removed pc-6001 platform
Removed the stepper-robot platform
Removed the stk500/stk501 platforms
Removed the redbee platforms
Removed the old esb regression tests
The pc-6001 platform was the last z80 platform in the tree, so we'll remove the cpu/z80 directory too
Added a way to obtain the RSSI from the CC2538 RF core
Added a function for setting promiscous mode on the CC2538 RF core
Added header declarations for cc2538_rf_read_rssi() and cc2538_rf_set_promiscous_mode()
Added missing argument declaration
Merge pull request #458 from adamdunkels/push/cc2538-rf

CC2538 RF core additions
Merge pull request #449 from darki2002/cooja_default.config

Start DGRMConfigurator and DGRMVisualizerSkin in cooja_default.config
Merge pull request #438 from adamdunkels/push/cleanup-platforms

Massive platform cleanup
Removed the old unused hc.[ch] code
Removed old, unused rawpacket code
Merge pull request #461 from adamdunkels/push/cleanup-net

Cleanup: Removal of old unused core/net/ modules
RPL DAO timers and management:
* Added a DAO lifetime timer that sends out a new DAO after half the lifetime of the DAO. This allows implementing DAO route soft state that avoids routing tables in the network keeping stale routes for ever.
* Added ways to schedule a new DAO transmission as well as cancelling an active DAO transmit timer, which makes it possible to do nodes that don't send DAOs.