insert space between "for" keyword and "(" (#215)

* insert space between "for" keyword and "("

In order to follow the standard JavaScript coding style.

* trim final newline

snippets/js-mode/for

@@ -1,6 +1,6 @@
-# -*- mode: snippet -*-
-#name : for
+# -*- mode: snippet; require-final-newline: nil -*-
+# name: for
 # --
-for(var ${1:i} = ${2:0}; $1 < ${3:collection}.length; $1++) {
+for (var ${1:i} = ${2:0}; $1 < ${3:collection}.length; $1++) {
   $0
 }