Added GPS support (not tested)
Removed SPI declarations since SPI is not available on naze32
Fixed a bug in STM32F10x\pios_usart.c: the usart_dev structure is not set to zero, leading to an hardfault by calling usart_dev->tx_out_cb
Code cleanup for easier comparison with git://git.openpilot.org/OpenPilot.git
Added 'Crossworks for arm' project for naze32