fix(Builds): Turn off Safari 5 for SL

Safari 5 seems to be hanging a lot (I believe) on SauceLabs. They're own
statistics confirms that it is just an awful browser: https://saucelabs.com/resources/the-surprising-worst-browser

Hopefully this will get builds to complete

Author: c0bra

lib/grunt/utils.js

@@ -65,12 +65,13 @@ var util = module.exports = {
         base: 'SauceLabs',
         browserName: 'firefox'
       },
-      'SL_Safari_5': {
-        base: 'SauceLabs',
-        browserName: 'safari',
-        platform: 'Mac 10.6',
-        version: '5'
-      },
+      // NOTE: this seems to be hanging builds a lot so I'm turning it off -- Brian (20141118)
+      // 'SL_Safari_5': {
+      //   base: 'SauceLabs',
+      //   browserName: 'safari',
+      //   platform: 'Mac 10.6',
+      //   version: '5'
+      // },
       'SL_Safari_6': {
         base: 'SauceLabs',
         browserName: 'safari',