Removed all references to a specific MCU in "generic" files
Inclusion of generic <msp430.h> file is done in cpu.h
Made the headers of files in 'cpu/msp430x16x' and 'cpu/cc430' generic
Added definition of correct MCU model in MSP430-based board headers
Removed 'flashrom.c' from the 'msp430-common' directory
since flash management differs with the MSP430 family
Added the needed new section for telosb in boards/Makefile.base
put prototype for thread_yield() in core/include
Merge pull request #439 from OlegHahm/thread_yield_prototype

put prototype for thread_yield() in core/include
Quoted (instead of brackets) the custom header files #includes
Merge pull request #408 from rousselk/simplify-msp430-headers

Simplify msp430 headers