Cleanup console.* uses

* Stop doing `global.console && ...`
* Make sure all uses are behind `__DEV__` checks so they get stripped out

Author: zpao

src/core/ReactCompositeComponent.js

@@ -902,7 +902,7 @@ var ReactCompositeComponent = {
    */
   autoBind: function(method) {
     if (__DEV__) {
-      console.warn && console.warn(
+      console.warn(
         'React.autoBind() is now deprecated. All React component methods ' +
         'are auto bound by default, so React.autoBind() is a no-op. It ' +
         'will be removed in the next version of React'

src/core/ReactInstanceHandles.js

@@ -320,11 +320,13 @@ var ReactInstanceHandles = {
       }
     }
 
-    global.console && console.error && console.error(
-      'Error while invoking `findComponentRoot` with the following ' +
-      'ancestor node:',
-      ancestorNode
-    );
+    if (__DEV__) {
+      console.error(
+        'Error while invoking `findComponentRoot` with the following ' +
+        'ancestor node:',
+        ancestorNode
+      );
+    }
     invariant(
       false,
       'findComponentRoot(..., %s): Unable to find element. This probably ' +

src/dom/components/ReactDOMTextarea.js

@@ -53,10 +53,12 @@ var ReactDOMTextarea = ReactCompositeComponent.createClass({
     // TODO (yungsters): Remove support for children content in <textarea>.
     var children = this.props.children;
     if (children != null) {
-      console.warn(
-        'Use the `defaultValue` or `value` props instead of setting children ' +
-        'on <textarea>.'
-      );
+      if (__DEV__) {
+        console.warn(
+          'Use the `defaultValue` or `value` props instead of setting ' +
+          'children on <textarea>.'
+        );
+      }
       invariant(
         defaultValue == null,
         'If you supply `defaultValue` on a <textarea>, do not pass children.'