Enable shebang rule for other files

[jordanbtucker]

Currently the shebang rule only ensures that the file referenced by the bin field in package.json has a shebang. However, there are times when you want other files to be run as scripts, say in a scripts directory in your project.

I recommend adding an option to ensure that all files matched by a glob pattern also require a shebang. This would also ensure that those files don't have any other shebang related issues like BOM or non-LF line breaks.