tri gyro data reading fix - closes issue #18

git-svn-id: https://afrodevices.googlecode.com/svn/trunk/baseflight@464 7c89a4a9-59b9-e629-4cfe-3a2d53b20e61
remove stm32_gpio.c from project and fix EXTI-using drivers w/local version of gpioExtiLineConfig.

git-svn-id: https://afrodevices.googlecode.com/svn/trunk/baseflight@465 7c89a4a9-59b9-e629-4cfe-3a2d53b20e61
Merge remote-tracking branch 'upstream/upstream' into disq