add basic constant loader ... needs a default yaml loader
add yaml config loader to the mix
Ahhh ... add the new classes
tabs to spaces
rewrote test but not passing; tab to spaces
rewrote test but not passing; tab to spaces
ignore coverage_report; restructured constant loading test and implementation
add exception when file cannot be found
remove abstract constraint
updated types to support integer
update license
remove composer.lock
ignore composer.lock