Adjust according to review

Author: vidartf

README.md

@@ -67,11 +67,14 @@ pythreejs/traits.py
 # Overridden classes
 js/src/core/Object3D.js
 js/src/textures/DataTexture.js
-js/src/textures/ImageTexture.js # custom classed created to ease image texture loading
 js/src/renderers/WebGLRenderer.js
 pythreejs/core/Object3D.py
 pythreejs/renderers/WebGLRenderer.py
 
+# Custom classes
+js/src/textures/ImageTexture.js  # created to ease image texture loading
+js/src/textures/TextTexture.js  # created to ease creation of textures of rasterized text
+
 # Updated examples notesbooks
 examples/Examples.ipynb
 examples/Geometries.ipynb

js/scripts/prop-types.js

@@ -22,11 +22,11 @@ _.extend(BaseType.prototype, {
     },
 })
 
-function ThreeType(typeName, nullable=true) {
+function ThreeType(typeName, options={}) {
     this.typeName = typeName;
     this.defaultValue = null;
     this.serialize = true;
-    this.nullable = nullable;
+    this.nullable = bool(options.nullable);
 }
 _.extend(ThreeType.prototype, BaseType.prototype, {
     getTraitlet: function() {

js/scripts/three-class-config.js

@@ -862,6 +862,8 @@ module.exports = {
             encoding:         new Types.Enum('TextureEncodings', 'LinearEncoding'),
             version:          new Types.Int(0),
         },
+        // As the image property is not exposed, we don't define constructorArgs.
+        // The image property is hidden, as it does not have a good corresponding python type (yet)
         //constructorArgs: [ 'image', 'mapping', 'wrapS', 'wrapT', 'magFilter', 'minFilter', 'format', 'type', 'anisotropy' ],
         propsDefinedByThree: [ 'id', 'uuid', 'version' ],
     },