Description of the feature request:

Currently .bazelignore supports only full relative path prefix without any wildcards

I have many node_modules subfolders in my repo that I want to ignore.
With .gitignore I'd just need to put: node_modules and it will be ignored by git.
With .bazelignore I need to specify each folder by it's full relative path from workspace root.

I suggest to adjust behavior to the way .gitignore and save our users the trouble of collecting all folders.

What operating system are you running Bazel on?

We tested it on linux with bazel 0.20.0 and 0.21.0