Remove moot `version` property from bower.json

Per bower/bower.json-spec@a325da3

bower.json

@@ -1,6 +1,5 @@
 {
 	"name": "three.js",
-	"version": "0.0.71",
 	"homepage": "http://threejs.org/",
 	"description": "JavaScript 3D library",
 	"main": "build/three.js",