initial commit for TelosB support
implemented stdin for TelosB
added board dependent part of the cc2420 for TelosB
fixed interrupt implementation (#27)

removed TIMERB0 interrupt (since we don't use SFD information for now)

enable FIFOP interrupt in init_interrupts()
Force Git to ignore backup files
Updated the MCU frequency from 800 KHz to (a more likely) 8 MHz.
Merge pull request #26 from OlegHahm/telosb

Telosb support