Merge pull request #3 from LudwigOrtmann/master

patch native board for current Makefile structure
* fixed bindir creation in msba2 Makefile
* adapted Makefiles to core restructuring
modified and cleaned some files to build RIOT for chronos
Merge pull request #4 from mikoff/master

chronos support updated
* changed MCU name to adapt to current msp430-gcc version
* removed unnecessary line from msba2 Makefile
* initial commit for yet not working redbee support
* fixed flasher flags for MSB-A2
* added required include for msb-430-common
adapted native Makefiles to core restructuring