Add frontend assets and plugin bundles

Add the legacy frontend themes, scripts, and plugin assets required by the main SPOTA interfaces.

assets/plugins/jQRangeSlider/Readme.md

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+jQRangeSlider, jQDateRangeSlider & jQEditRangeSlider [![Build Status](https://travis-ci.org/ghusse/jQRangeSlider.png?branch=master)](https://travis-ci.org/ghusse/jQRangeSlider)
+====================================================
+A javascript slider selector that supports dates and touch devices
+
+* [Home page](http://ghusse.github.com/jQRangeSlider/)
+* [Documentation](http://ghusse.github.com/jQRangeSlider/documentation.html)
+* [Support & suggestions](https://jqrangeslider.uservoice.com/)
+* [Github](https://github.com/ghusse/jQRangeSlider/)
+* [Twitter](https://twitter.com/jQRangeSlider)
+
+License
+-------
+Copyright : Guillaume Gautreau 2010
+License : Dual license GPL v3 and MIT
+
+Dependencies
+------------
++ jQuery
++ jQuery UI core
++ jQuery UI widget
++ jQuery Mousewheel plugin by Brandon Aaron (optional, needed for scrolling or zooming)
+
+
+Generating minified jQRangeSlider files
+---------------------------------------
+
+You need nodejs and npm. Open a command line interface and run:
+
+     npm install
+     npm install -g grunt-cli
+
+Now you can minify jQRangeSlider and build a zip package by running
+
+     grunt
+
+You can launch jshint and unit tests too:
+
+     grunt ci
+