add support for GPIO remapping (copied from stm32f_gpio.c)
support 1S battery for voltage monitoring
Merge pull request #99 from treymarc/serialrx_msp

Serialrx msp
adding rxmsp to uvision project
updated ADC driver to use more of available inputs, as well as made input selection more sane
moved some of init logic around to get sensors + other important hardware checked first; added dummy implementation of production test for future use, outputting debug info over PB6  (USART1_TX remap)
slight refactoring of PPM/PWM failsafe to make it actually work and honor failsafeThreshold value.
rearranged startup / sensor detection for production testing. moved dead gyro endless loop out of the way.
make flipping the quad safe with althold engaged

this should stop the copter from accelerating downwards, when upside
down with althold enabled.
Merge pull request #101 from luggi/althold-flipable

make flipping the quad safe with althold engaged
Merge remote-tracking branch 'upstream/master' into hil