erased old comments
added comments to detail next section
get units test for Celsius
get units test for Fahrenheit
get units test for Kelvin
added notes to detail getValue tests
get value test for Celsius
get value test for Fahrenheit
get value test for Kelvin
added notes to detail changeUnit tests
added changeUnit test for changing from Kelvin
added changeUnit test for changing from Celsius
added changeUnit test for changing from Fahrenheit
changed sample usage to reflect proper constructors
added check for below abs zero nums
added below abs zero exception test cases
added tests for temps at theoretical abs hot
Planck temperature fixed
added class constructor error cases
added test for changing to invalid units