Use main's arguments list instead of deprecated dart:io's Options

Fixes #98
Merge pull request #99 from belua/upstream

Use main's arguments list instead of deprecated dart:io's Options
Merge pull request #97 from belua/master

Added usage documentation to README.
Fix failing unit test
clean up hop Task
Merge pull request #101 from financeCoding/master

unit tests now passing
remove Options class
updating config for new release
remove dev
release discovery api client
move to 0.4.3-dev