switch drag & drop lib

dashboard-ui/bower_components/Sortable/CONTRIBUTING.md

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+# Contribution Guidelines
+
+### Issue
+
+ 1. Try [dev](https://github.com/RubaXa/Sortable/tree/dev/)-branch, perhaps the problem has been solved;
+ 2. [Use the search](https://github.com/RubaXa/Sortable/search?q=problem), maybe already have an answer;
+ 3. If not found, create example on [jsbin.com (draft)](http://jsbin.com/zunibaxada/1/edit?html,js,output) and describe the problem.
+
+---
+
+### Pull Request
+
+ 1. Before PR run `grunt`;
+ 2. Only into [dev](https://github.com/RubaXa/Sortable/tree/dev/)-branch.
+
+### Setup
+
+ Pieced together from [gruntjs](http://gruntjs.com/getting-started)
+
+ 1. Fork repo on [github](https://github.com)
+ 2. Clone locally
+ 3. from local repro ```npm install```
+ 4. Install grunt-cli globally ```sudo -H npm install -g grunt-cli```