[cfignore] explicitly include globs [fixes #105]

Explicitly include globs of files, that were
otherwise ignored/excluded by the .cfignore file
using the prefix !

    # .cfignore
    node_modules
    !node_modules/common

This matches the .gitignore syntax for explicit inclusion.
Merge branch 'cfignore-inclusions' of https://github.com/drnic/cf-cli
Add tests for .cfignore inclusions

[#67147682]