pkgutil is slower than glob
importing modules dynamically is slow
avoid instantiating TaskGraph instance until command is actually executed. this is an order of magnitude faster for responsive tab completion
minor fixes to help text
Merge pull request #47 from deanmalmgren/autocomplete-performance

Autocomplete performance
fixed behavior when no workflow.yaml found
using Pillow to read rgb values of images
using resources to do inter-task linking now
added regular expression completion options
minor fix to image-colors
added kwargs for run command execution
moved command rendering to runtime
made iter_graph a...iterator
merge