Bee must now be allocated on the stack. Heap allocation is inadvisable on embedded systems.

Removed all dynamic memory allocations. The heap was quickly and
unpredictably becoming fragmented after receiving frames of varying
sizes. Still need to find a way to effectively change the static buffer
size on-compile in Arduino’s build process (currently set at 255). That
value needs to be optimized for specific implementations.

Also moved HardwareSerial begin call from the constructor to Bee::begin
so you can initialize the class globally and begin the serial in your
setup function.