Add additional pre-commit hooks (#245)

* Add and run end-of-file-fixer
* Add and run trailing-whitespace
* Add and run check-yaml
* Add and run check-json
* Add and run pretty-format-yaml
* Fix comment indentation

pyscriptjs/examples/webgl/raycaster/style.css

@@ -28,7 +28,7 @@ canvas {
 a, a:hover, a:visited {
   color: red;
   text-decoration: none;
-} 
+}
 .disable-selection {
      -moz-user-select: none; /* Firefox */
       -ms-user-select: none; /* Internet Explorer */
@@ -50,4 +50,4 @@ h2::after {
   position:absolute;
   top: 14px;
   padding-left: 5px;
-}
+}