cpu/lpc1768: heavy clean-up of existing code

- moved to new port structure
- rewrote startup code
- added implementation dummies for UART and timer
- switched to atmel linkerscript
- cleaned up Makefiles
board/mbed_lpc1768: heavy clean-up

- removed legacy code
- added default defines
- created periph_conf.h
Initial import of the updated srf02 driver with general i2c interface
Merge pull request #2045 from haukepetersen/fix_board_mbed

board/mbed_lpc1768: remodeled to our board/cpu structure
Merge pull request #1871 from PeterKietzmann/add_srf02_general_i2c_if

drivers/srf02: adapted ultrasonic ranger driver to general i2c interface
Basic DAC Driver, implementation on stm32f4discovery
Merge branch 'master' of github.com:brummer-simon/RIOT