Add new port: devel/hs-ShellCheck

The goals of ShellCheck are:

• To point out and clarify typical beginner's syntax issues, that causes a shell to give cryptic error messages.
• To point out and clarify typical intermediate level semantic problems, that causes a shell to behave strangely and counter-intuitively.
• To point out subtle caveats, corner cases and pitfalls, that may cause an advanced user's otherwise working script to fail under future circumstances.

WWW: http://www.shellcheck.net/

PR: 197302
Submitted by: luca.pizzamiglio@gmail.com
Obtained from: FreeBSD Haskell