Add Gulp file to resolve issue #478

These changes result in a Gulpfile having the same features as its Grunt counterpart.  I wrote this code
in response to issue #478  I put the gulpfile in a directory named **gulp-able** along with README and package.json files.
I received an error here. Needed to update the path to './server.js'

```
gulp.task('loadTestSchema', function () {
  require('./server.js');
  require('meanio/lib/util').preload(__dirname + '/packages/**/server', 'model');
});
```