Merge pull request #13 from sabberworm/support-omitted-shortarg

Fix error when using shortest configuration
Merge pull request #14 from sabberworm/throw-error-on-last-rule

Fix missing argument validation on last option
Merge pull request #15 from sabberworm/allow-complex-filters

Pass the list of unparsed tokens to the filter
Added parser.parse to example

Closes #12
Merge https://github.com/jfd/optparse-js