Add the CSG Viewer visualization plugin

based on conversations here:
galaxyproject#1191 (comment)

config/plugins/visualizations/csg/config/csg.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE visualization SYSTEM "../../visualization.dtd">
+<visualization name="CSG Viewer">
+    <data_sources>
+        <data_source>
+            <model_class>HistoryDatasetAssociation</model_class>
+            <test type="isinstance" test_attr="datatype" result_type="datatype">constructive_solid_geometry.PlyAscii</test>
+            <test type="isinstance" test_attr="datatype" result_type="datatype">constructive_solid_geometry.PlyBinary</test>
+            <test type="isinstance" test_attr="datatype" result_type="datatype">constructive_solid_geometry.VtkAscii</test>
+            <test type="isinstance" test_attr="datatype" result_type="datatype">constructive_solid_geometry.VtkBinary</test>
+            <to_param param_attr="id">dataset_id</to_param>
+        </data_source>
+    </data_sources>
+    <params>
+        <param type="dataset" var_name_in_template="hda" required="true">dataset_id</param>
+    </params>
+    <template>csg.mako</template>
+</visualization>

config/plugins/visualizations/csg/static/Detector.js

@@ -0,0 +1,79 @@
+/**
+ * Origin: https://raw.githubusercontent.com/mrdoob/three.js/af21991fc7c4e1d35d6a93031707273d937af0f9/examples/js/Detector.js
+ * @author alteredq / http://alteredqualia.com/
+ * @author mr.doob / http://mrdoob.com/
+ */
+
+var Detector = {
+
+    canvas: !! window.CanvasRenderingContext2D,
+    webgl: ( function () {
+
+        try {
+
+            var canvas = document.createElement( 'canvas' ); return !! ( window.WebGLRenderingContext && ( canvas.getContext( 'webgl' ) || canvas.getContext( 'experimental-webgl' ) ) );
+
+        } catch ( e ) {
+
+            return false;
+
+        }
+
+    } )(),
+    workers: !! window.Worker,
+    fileapi: window.File && window.FileReader && window.FileList && window.Blob,
+
+    getWebGLErrorMessage: function () {
+
+        var element = document.createElement( 'div' );
+        element.id = 'webgl-error-message';
+        element.style.fontFamily = 'monospace';
+        element.style.fontSize = '13px';
+        element.style.fontWeight = 'normal';
+        element.style.textAlign = 'center';
+        element.style.background = '#fff';
+        element.style.color = '#000';
+        element.style.padding = '1.5em';
+        element.style.width = '400px';
+        element.style.margin = '5em auto 0';
+
+        if ( ! this.webgl ) {
+
+            element.innerHTML = window.WebGLRenderingContext ? [
+                'Your graphics card does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">WebGL</a>.<br />',
+                'Find out how to get it <a href="http://get.webgl.org/" style="color:#000">here</a>.'
+            ].join( '\n' ) : [
+                'Your browser does not seem to support <a href="http://khronos.org/webgl/wiki/Getting_a_WebGL_Implementation" style="color:#000">WebGL</a>.<br/>',
+                'Find out how to get it <a href="http://get.webgl.org/" style="color:#000">here</a>.'
+            ].join( '\n' );
+
+        }
+
+        return element;
+
+    },
+
+    addGetWebGLMessage: function ( parameters ) {
+
+        var parent, id, element;
+
+        parameters = parameters || {};
+
+        parent = parameters.parent !== undefined ? parameters.parent : document.body;
+        id = parameters.id !== undefined ? parameters.id : 'oldie';
+
+        element = Detector.getWebGLErrorMessage();
+        element.id = id;
+
+        parent.appendChild( element );
+
+    }
+
+};
+
+// browserify support
+if ( typeof module === 'object' ) {
+
+    module.exports = Detector;
+
+}