fix for creating new Sortable with SortableJS 1.5.1 #45
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SortableJS 1.5.1 has a create() function for creating a new Sortable object. It was causing some TypeErrors as new Sortable() was not a constructor anymore.
This changes the implementation to create a new Sortable object using the create function instead.
Also, updates de README file for mapping correctly the minify version of sortablejs in SystemJS configuration.
Fixes #42