Nano Syntax Highlighting for Batch-file Shell Scripts.

* This file is currently included within the popular repo scopatz/nanorc !

Features

A big list of cmd commands extracted from SS64.
- 40 native commands + 151 common commands.
- For judging whether a command is "common", I used the highlighting of Github and Sublime as a reference.
Conformed to the color-coding convention as of sh.nanorc and many others.
Detect the syntax from the @ECHO OFF header automatically.
Comment out a line with REM automatically when keybinding (default: M-3) been pressed.