Further reduced the number of tests on Safari and IE, due to sporadic failures

Author: JamesMessinger

test/fixtures/test-helper.js

@@ -30,11 +30,11 @@
       describe(suite, function () {
         var tests = Object.keys(testData[suite]);
 
-        if (host.karma && host.browser && (host.browser.IE || host.browser.safari)) {
+        if (host.env.CI && host.karma && host.browser && (host.browser.IE || host.browser.safari)) {
           // These browsers sporadically fail when run in SauceLabs via Karma.
           // So only run a subset of the tests to reduce the chance of failure.
           tests = tests.filter(function (test, index) {
-            if (index % 15 === 0) {
+            if (index % 25 === 0) {
               return test;
             }
           });