Fix config variable exposing to global scope

lib/sailsCacheman.js

@@ -8,7 +8,7 @@ var Cache = function (name) {
    var _ = require('underscore');
    var options = {};
    // Get configuration
-   config = sails.config.cacheman;
+   var config = sails.config.cacheman;
    if (config === undefined) {
         throw new Error('No configuration file found. Please add the configuration app/config/cacheman.js');
    }