Rake -> Thor

[maxlinc]

I prefer Thor (w/ or w/out a CLI) for a few reasons:

• You can use it like Rake, but it's also better as CLIs. That's better for Pacto to become a polyglot project (Ruby bindings available, but CLI + server can be used for non-Ruby projects)
• Much better handling of arguments and options so you can do things like "--strict", vs Rake's hacky way of passing parameters.
• Better documentation for commands w/ descriptions of available options/arguments.
• Easier to test - they're just Ruby classes.
• A lot of useful helpers (see Thor::Shell and Thor::Actions especially)

[coveralls]

Coverage increased (+1.2%) when pulling 6738e8e on maxlinc:thor into 89185cc on thoughtworks:master.

[coveralls]

Coverage decreased (-0.04%) when pulling 50f50d9 on maxlinc:thor into 4498654 on thoughtworks:master.

[coveralls]

Coverage increased (+0.3%) when pulling d5302e8 on maxlinc:thor into 4498654 on thoughtworks:master.