Solved a problem when calling the close function more than once. The thread identifier was needed but no longer valid from the second call.

Implemented the main internal thread to handle the reception of new status messages from both platforms and make the necessary computations.
Modified the example to use the new driver structure.

Exported the Segway RMP200 events to this driver.
Added a new event to notify the availability of the two status structures.

Afegida opcio a l'exemple per tal de llencar el programa sense que el robot es mogui. Actualitzada la api

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Modified the main CMakeLists.txt to set the compiler flags for the C++ compiler instead of the C compiler.
Solved some compilation warnings that appeared.

This should be consider in upper levels and leave the low level to really
do any kind of movement.

Don't need to convert to them anymore.

Thanks to Joan Perez and Sergi Hernandez for spotting it.

get_status() will return an struct of type TSegwayRMP400Status

Googletest framework is used. Basica actions on the library
are tested.

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