removing minified version as suggested in #341

This commit removes jquery.nicescroll.min.js from the bower.json `main` as suggested by @daviesgeek
and explained in the bower spec http://bower.io/docs/creating-packages/

    `main` string or array: The primary acting files necessary to use your package.

bower.json

@@ -3,7 +3,6 @@
     "version": "3.5.4",
     "main": [
         "./jquery.nicescroll.js",
-        "./jquery.nicescroll.min.js",
         "./zoomico.png"
     ],
     "ignore": [