add director$resource method
begin registry refClass
add colourise helper method and checks in initialize method of registry refClass
redoc
add registry#set method
director#.sanitize_key method
registry#get method
tests for registry#initialize
finished tests for registry#.sanitize_key
test registry$get and set methods
usage example for registry
add registry vignette
mv batch_data.Rmd registry.Rmd (typo)
add description to registry refClass
Use newly created registry in director$resource method
test for when retrieval of non-existent key yields NULL when soft = TRUE
use digest package for resources cache keys
Allow multiple arguments to registry$get function to be joined with
file.path
test for multiple argument syntax for registry$get
fix director$resource method