Add templates path to gulpfile.js config

[gmarziou]

Fix #219

[gruppjo]

Since this is a nice non-intrusive change, I'll merge this right away. Thanks for the good work :)
We'll discuss any other changes that are necessary on this regard on a case per case basis ok?

[gmarziou]

Great, thanks.

I'll open new issues to discuss other potential changes.

With this change, I am able to adapt your gulp build to JHipster structure by changing the paths like this:

gulp.paths = {
  dist: 'www',
  templates: ['app/**/*.html', '!app/index.html', '!app/bower_components/**/*.html'],
  jsFiles: ['app/**/*.js', '!app/bower_components/**/*.js'],
  jsonFiles: ['app/**/*.json', '!app/bower_components/**/*.json']
};

[gruppjo]

wonderful 👍