[boards] AVS-Extrem-Board + new Drivers for the MSBA2-based Boards (LPC2387 CHIP) + Full abstracted I2C-Interface-Divers (#11)

. Support of the AVS-Extrem-Board. . Porting from the CC1100-, SSP0-, and the SMB38-Drivers of the AVS-Extrem-Board in RIOT. . Full abstracted I2C-Interface-Driver for the LPC2387 Chip. . Driver for the SRF02 ultrasonic sensor. . Driver for the SRF08 ultrasonic sensor. . Driver for the LM75A temperature sensor demonstrating the use of the i2c-interface and the external interrupts

Closed #11.

Reopened #11.