Improved & unified deprecation handling

* De-duplication now happens in core, not in reporters. This ensures that
  the console doesn't get flooded.
* Stack traces are opt-out, not opt-in.
* The current runnable is not reported or logged for certain deprecations
  where it's irrelevant.
* HtmlReporter shows stack traces in expandable widgets.
* Env#deprecated and Env#deprecatedOnceWithStack are merged.

src/html/HtmlReporter.js

@@ -277,7 +277,8 @@ jasmineRequire.HtmlReporter = function(j$) {
       addDeprecationWarnings(doneResult);
 
       for (i = 0; i < deprecationWarnings.length; i++) {
-        var context;
+        var children = [],
+          context;
 
         switch (deprecationWarnings[i].runnableType) {
           case 'spec':
@@ -290,13 +291,23 @@ jasmineRequire.HtmlReporter = function(j$) {
             context = '';
         }
 
+        deprecationWarnings[i].message.split('\n').forEach(function(line) {
+          children.push(line);
+          children.push(createDom('br'));
+        });
+
+        children[0] = 'DEPRECATION: ' + children[0];
+        children.push(context);
+
+        if (deprecationWarnings[i].stack) {
+          children.push(createExpander(deprecationWarnings[i].stack));
+        }
+
         alert.appendChild(
           createDom(
             'span',
             { className: 'jasmine-bar jasmine-warning' },
-            'DEPRECATION: ' + deprecationWarnings[i].message,
-            createDom('br'),
-            context
+            children
           )
         );
       }
@@ -611,17 +622,44 @@ jasmineRequire.HtmlReporter = function(j$) {
       if (result && result.deprecationWarnings) {
         for (var i = 0; i < result.deprecationWarnings.length; i++) {
           var warning = result.deprecationWarnings[i].message;
-          if (!j$.util.arrayContains(warning)) {
-            deprecationWarnings.push({
-              message: warning,
-              runnableName: result.fullName,
-              runnableType: runnableType
-            });
-          }
+          deprecationWarnings.push({
+            message: warning,
+            stack: result.deprecationWarnings[i].stack,
+            runnableName: result.fullName,
+            runnableType: runnableType
+          });
         }
       }
     }
 
+    function createExpander(stackTrace) {
+      var expandLink = createDom('a', { href: '#' }, 'Show stack trace');
+      var root = createDom(
+        'div',
+        { className: 'jasmine-expander' },
+        expandLink,
+        createDom(
+          'div',
+          { className: 'jasmine-expander-contents jasmine-stack-trace' },
+          stackTrace
+        )
+      );
+
+      expandLink.addEventListener('click', function(e) {
+        e.preventDefault();
+
+        if (root.classList.contains('jasmine-expanded')) {
+          root.classList.remove('jasmine-expanded');
+          expandLink.textContent = 'Show stack trace';
+        } else {
+          root.classList.add('jasmine-expanded');
+          expandLink.textContent = 'Hide stack trace';
+        }
+      });
+
+      return root;
+    }
+
     function find(selector) {
       return getContainer().querySelector('.jasmine_html-reporter ' + selector);
     }
@@ -635,11 +673,23 @@ jasmineRequire.HtmlReporter = function(j$) {
       }
     }
 
-    function createDom(type, attrs, childrenVarArgs) {
-      var el = createElement(type);
+    function createDom(type, attrs, childrenArrayOrVarArgs) {
+      var el = createElement(type),
+        children,
+        i;
 
-      for (var i = 2; i < arguments.length; i++) {
-        var child = arguments[i];
+      if (j$.isArray_(childrenArrayOrVarArgs)) {
+        children = childrenArrayOrVarArgs;
+      } else {
+        children = [];
+
+        for (i = 2; i < arguments.length; i++) {
+          children.push(arguments[i]);
+        }
+      }
+
+      for (i = 0; i < children.length; i++) {
+        var child = children[i];
 
         if (typeof child === 'string') {
           el.appendChild(createTextNode(child));