exclude-pattern improvements

**Is your feature request related to a problem? Please describe.**
No.

**Describe the solutions you'd like**

1. Exclude **all** minimized JavaScript files, not just the ones is the normal `assets/js/` directory.
```diff
- assets/js/*.min.js
+ *.min.js
```
1. Only exclude these directories if they are at the top-level path that is being filtered.
```diff
- tests/*
+ ^tests/*
- tmp/*
+ ^tmp/*
- gulpfile.js/*
+ ^gulpfile.js/*
```
1. Limit the pattern to directories with a specific name. `./vendor/` vs. `./prefix-vendor/`
```diff
- vendor/*
+ */vendor/*
- node_modules/*
+ */node_modules/*
```