Only require needed lodash modules

[adriaanmeuris]

Great library, works better out of the box than vue-sortable in my opinion.

One improvement I think is to only required the needed lodash modules for your directive.

Now the entire lodash library is included (about 80kb minified):
var _ = require("lodash");

You could simply require the needed modules (about 21kb minified):
var _clone = require("lodash/clone");
var _merge = require("lodash/merge");
var _isString = require("lodash/isString");
var _each = require("lodash/each");

.. which would save about 60kb.

[David-Desmaisons]

Seems a good idea. I'm now working on #8 that may increase the number of lodash functions in use by Vue.Dragable.For. So, I will consider issue#10 once I am done with #8 .

[David-Desmaisons]

New version is not using lodash anymore