Splitted up autodetection patterns for Bash

This will match:

- `*.bash` (any manufactured Bash scripts)
- `~/.bashrc` (hidden Bash configuration in your home directory)
- `~/.bash_*` (partials included by bashrc, e.g. `.bash_aliases`,  `.bash_history`,  `.bash_logout`)
- `/etc/bash.bashrc` (global Bash configuration)
- `/etc/bash_completion` (and potentially any other `/etc/bash_*` file)