New platform: TI cc2530 Development Kit

This commits adds support for TI's SmartRF05 Eval. Board with cc2530 EMs
Some initial support for cc2531 USB dongles

examples/cc2530dk/border-router/README

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+border-router example for the TI SmartRF05EB with a cc2530EM.
+
+This example is meant to be used with tunslip6 in tools/
+
+- Build the code and load it onto your node
+- Connect your node to your PC
+- run:
+  sudo ./tunslip6 -s /dev/ttyUSBx <address v6>/<prefix>
+  
+  This will setup tun0 on your PC over device /dev/ttyUSBx. The address
+  argument should contain the v6 address that you want to assign to tun0
+  The node will use this address to obtain the network prefix
+  
+  for example:
+  sudo ./tunslip6 aaaa::1/64
+  This will use aaaa:: / 64 as the prefix for the 15.4 network.