Port shellcheck, shfmt & forbid-binary

[syntaqx]

There seems to be an issue referencing #!/bin/sh and #!/bin/bash directly in bash emulators within Windows at the moment, so I'm porting these git-hooks from https://github.com/jumanjihouse/pre-commit-hooks until pre-commit either patches or the emulators emulate around it.

Credit has been given in the files and our licenses are compatible.

Also, added some minor CircleCI testing..