Write all of the output from each process to the screen

[h-bragg]

Resolves #11

• Adds a new class: Lines This outputs the result of each process to the console.
  • Each process supports key/value tagging (so you know which process is which)
• Every message returned from the process is called in $onProgress (so you can do it yourself)
• Added callable $onStart event to notify when a process starts.
• Brings Makefile et al in line with other open source projects