Authorized archer.
Bumped archer to 0.1.2.
Implemented invoker.
PSR compliance.
Added tests for optional default parameters, and explicit test for non-optional parameters with defaults (which will not work in PHP < 5.3.17).
Removed unused Liberator dependency.
Update README.md
Added support for positional arguments, python style.
Updated dependencies.
Updated README [ci skip]
Update README.md [ci skip]
Housekeeping.
Updated changelog.
Merge branch 'release/0.1.0'