Fix clearStoredLevels() helper and remaining tests

The `clearStoredLevels()` helper did not work correctly for named
loggers -- it looked for cookie names like `loglevel:whatever` instead
of `loglevel:%3Awhatever` (cookie names and values are URL-encoded).

This also fixes another test that started failing after an earlier fix,
I think because of timing/ordering issues. Explicitly clearing storage
before the test fixed the issue (the test was implicitly expecting
nothing to be stored).

test/default-level-test.js

@@ -23,6 +23,10 @@ define(['test/test-helpers'], function(testHelpers) {
         });
 
         describe("If no level is saved", function() {
+            beforeEach(function () {
+                testHelpers.clearStoredLevels();
+            });
+
             it("new level is always set", function(log) {
                 log.setDefaultLevel("trace");
                 expect(log).toBeAtLevel("trace");

test/test-helpers.js

@@ -165,7 +165,7 @@ define(function () {
             window.localStorage.clear();
         }
         if (self.isCookieStorageAvailable()) {
-            var storedKeys = window.document.cookie.match(/(?:^|;\s)(loglevel(\:\w+)?)(?=\=)/g);
+            var storedKeys = window.document.cookie.match(/(?:^|;\s)(loglevel(%3a\w+)?)(?=\=)/ig);
             if (storedKeys) {
                 for (var i = 0; i < storedKeys.length; i++) {
                     window.document.cookie = storedKeys[i] + "=; expires=Thu, 01 Jan 1970 00:00:01 GMT;";