Version 0.0.2 Remote Control (USART) STM32-server

The state machine can change state when new UART character is received.
There are 4 characters predefined for each state : S-start, I-on, X-off,
P-stop. They need to be respected in the PC version as well in order to
respect the protocol. The UART interruption (received characters) can be
tested only in real time not in the Simulator (Keil debug).
Merge branch 'master' of https://github.com/mape1991/LocalizationDRONE
Version 0.0.3 Remote Control

New version of STM32 server project. Modifications in the serial comm
service : Don't call receive data after interruption call, because the
register is read two times. Tested with the simulator. Each state is
correct and the code is robust. Place for improvement : How to process
Error code ?
Update README.md

Added introduction part for the stm32 server-beacons interface
merge with upstream master