Revert "Fixes gitignore to ignore directories properly"

This reverts commit e6c69ed3d26b3b4da5f952b5241bb23449487bcb.

The complexity of the fix for the problem trying to be solved in https://github.com/roots/bedrock/pull/128 was starting to get out of hand. Proposing we revert back to the previous way of doing things until we figure out a better way.

@davenaylor