Fix a bug where gowatch hangs of the underlying process exits unexpectedly.

This release makes it so that you can use gowatch as a library so that it can extend other development based programs.

Features:

1. You can now specify a path to a file not just a directory.

Breaking changes:

Because of the above, the flag/config names such as "Go dirs" and "Non Go dirs" don't make sense anymore, so they have been renamed to "go paths" and "non go paths".

• The config file and the lag names have been changed to be more correct and easier to write. For flags run gowatch --help. For config, GoDirs is now GoPaths and NonGoDirs are now NonGoPaths.