Started documenting bit type code

# Version 0.0.1 [0.0.1D2 'Or Silver Boston']
# Changes in bit_type.h
	+ Started documenting previously committed code w/Doxygen
# To do
	+ Take a look at std::rotate mechanisms, maybe replace custom rotate functions
	+ Think about relation operators overloading, or does that depend on the
	endianness
	+ Continue documenting previously committed code