some refactoring

This release is mostly documentation improvements. Although, there are some code improvements too.

• measure_adc() still exists, but its algorithm has been exposed as start_measure_adc() & get_measure_adc() for asynchronous applications.
• re-proritized parameters' order to relative_mode_config()
• changed examples to demonstrate proper namespacing as previous examples may have been confusing to newcomers in python