Use mixlib-shellout for shell calls, not backticks.
Use run_state to store transient information; don't hack the resource collection.
Correct misspelling of "installation"
Merge pull request #5 from juliandunn/username-misspelled

Correct misspelling of "installation"
Merge pull request #4 from juliandunn/use-run-state

code cleanup: use mixlib-shellout and run_state