Build: bower.json: remove moot `version` field

Related:
https://github.com/bower/bower.json-spec/commit/a325da3d79baab018c572d75dc1781b12322f6cd

Close gh-2304

build/release/dist.js

@@ -36,7 +36,6 @@ module.exports = function( Release, complete ) {
 	function generateBower() {
 		return JSON.stringify({
 			name: pkg.name,
-			version: pkg.version,
 			main: pkg.main,
 			license: "MIT",
 			ignore: [