Awesome
gulp-git-committers 
Get a committer list from a git repository with some sorting and formatting options.
Install
$ npm install --save-dev gulp-git-committers
Usage
var gulp = require('gulp');
var committers = require('gulp-git-committers');
gulp.task('default', function () {
return committers()
.pipe(gulp.dest('./AUTHORS.txt'));
});
Options
For a full list of options visit the official git-committers documentation.