Move to Gulp

[toddmotto]

Migrate this project to Gulp over Grunt.

[jonlow]

YES!

[joilsonmarques]

In my opinion, Grunt is more mature than Gulp and sure should implement changes very soon, that will reach a similar or superior level as well as the Gulp. At the moment I see no need to make this change.

I think it's a preference and not a necessity.