initial support for the mbed NXP LPC168

 * http://mbed.org/platforms/mbed-LPC1768/
fixes Makefiles for mbed_lpc1768 board
removed useless code
rename variables to match the guidelines (use module prefix)
initialize id and only remove a valid timer
clean up native ltc
remove ltc disable race
Merge pull request #318 from OlegHahm/lpc1768

initial support for the mbed NXP LPC168
Merge pull request #428 from mehlis/native-ltc-fix

Native ltc fixes and cleanup