Add go argsparser package

This package converts a command line string into a slice of its
arguments. It is necessary for the task wrapper we're writing which
converts gearman payloads to command line arguments for a process.

It's a bit hacky, but it's the best solution we could come up with.
Merge pull request #10 from Clever/parse-command-line-args

Add go argsparser package
Runs the worker wrapper as a command line utility
Rename a few things
Cmd code review feedback