Identation work on the SPI and I2C bus implementation. Now using baudrates in Hz instead of MHz. Improved the bitmask work for the bcm2835_spi_read_write function
Added device driver for the microchip mcp23008 I2C gpio port expander, along with a test case that uses that driver to operate an LED and a button connected to the mcp23008, which connects to the RPi through the I2C bus. Improved the spi_23k256_wait_ms function and reduced the waits from 50ms to 1ms