Handling of global installation

[gmemstr]

Currently, the script requires that the project being analyzed has either the modules it uses to be included in the project's vendor file, or the script itself (from which the dependencies will be pulled). This should not be assumed to be true, especially when using the smmccabe/docker docker image. Ideally, the script could detect if it is installed globally, and then fall back to using the globally installed commands.

[smmccabe]

I think we should probably just bundle it up as a phar?

[gmemstr]

Probably the easiest solution, then Github's release functionality can be used for better versioning as an added bonus.

[hopeseekr]

I'll definitely do this.