exclude-pattern improvements

[pondermatic]

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.

   -    <exclude-pattern>assets/js/*.min.js</exclude-pattern>
   +    <exclude-pattern>*.min.js</exclude-pattern>

2. Only exclude these directories if they are at the top-level path that is being filtered.

   -    <exclude-pattern>tests/*</exclude-pattern>
   +    <exclude-pattern type="relative">^tests/*</exclude-pattern>
   -    <exclude-pattern>tmp/*</exclude-pattern>
   +    <exclude-pattern type="relative">^tmp/*</exclude-pattern>
   -    <exclude-pattern>gulpfile.js/*</exclude-pattern>
   +    <exclude-pattern type="relative">^gulpfile.js/*</exclude-pattern>

3. Limit the pattern to directories with a specific name. ./vendor/ vs. ./prefix-vendor/

   -    <exclude-pattern>vendor/*</exclude-pattern>
   +    <exclude-pattern>*/vendor/*</exclude-pattern>
   -    <exclude-pattern>node_modules/*</exclude-pattern>
   +    <exclude-pattern>*/node_modules/*</exclude-pattern>