Bug fixes, performance changes, and some clean up#97

Merged

kbknapp merged 3 commits intomasterfrom patch-96

May 3, 2015

+183-262

Commits on May 3, 2015

fix(RequiredArgs): fixes bug where required-by-default arguments are not listed in usage
kbknapp
committed
perf(usage): improves usage string generation
kbknapp
committed
tests(run_tests.py): update known good error messages to new messages
kbknapp
committed