initial commit for remembrance w/ stageRunner
add some comments
introduce copy_env function and prepare subsequent stages
todo
success -- can now cache and re-run arbitrary stages, still have to clean this code up
print statement for stageRunner objects
fix a weird bug where indices are indistinguishable
undo coments
ignore case when running by name
Printing a stageRunner is now equivalent to listing its stages names
add nested environment handling to copy_env and unit tests
move logic that handles the "to" parameter into normalize_stage_keys
initial tests for caching with stagerunner
begin treeSkeleton reference class
add support for arbitrary R object to treeSkeleton
yeah!!-now this line is awesome
remove this comment
update documentation and finish unit tests for treeSkeleton
intermediate tests & docs pass step
intermediate surgery -- integrating treeSkeleton into stageRunner