feat(exception_handler): print originalException and originalStack for all exceptions

modules/angular2/src/dom/browser_adapter.dart

@@ -142,6 +142,18 @@ class BrowserDomAdapter extends GenericBrowserDomAdapter {
     window.console.error(error);
   }
 
+  log(error) {
+    window.console.log(error);
+  }
+
+  logGroup(error) {
+    window.console.group(error);
+  }
+
+  logGroupEnd() {
+    window.console.groupEnd();
+  }
+
   @override
   Map<String, String> get attrToPropMap => const <String, String>{
     'innerHtml': 'innerHTML',

modules/angular2/src/dom/browser_adapter.ts

@@ -61,6 +61,22 @@ export class BrowserDomAdapter extends GenericBrowserDomAdapter {
   // TODO(tbosch): move this into a separate environment class once we have it
   logError(error) { window.console.error(error); }
 
+  log(error) { window.console.log(error); }
+
+  logGroup(error) {
+    if (window.console.group) {
+      window.console.group(error);
+    } else {
+      window.console.log(error);
+    }
+  }
+
+  logGroupEnd() {
+    if (window.console.groupEnd) {
+      window.console.groupEnd();
+    }
+  }
+
   get attrToPropMap(): any { return _attrToPropMap; }
 
   query(selector: string): any { return document.querySelector(selector); }

modules/angular2/src/dom/dom_adapter.ts

@@ -23,6 +23,9 @@ export class DomAdapter {
   invoke(el: Element, methodName: string, args: List<any>): any { throw _abstract(); }
 
   logError(error) { throw _abstract(); }
+  log(error) { throw _abstract(); }
+  logGroup(error) { throw _abstract(); }
+  logGroupEnd() { throw _abstract(); }
 
   /**
    * Maps attribute names to their corresponding property names for cases

modules/angular2/src/dom/html_adapter.dart

@@ -27,6 +27,11 @@ class Html5LibDomAdapter implements DomAdapter {
     stderr.writeln('${error}');
   }
 
+  log(error) { stdout.writeln('${error}'); }
+  logGroup(error) { stdout.writeln('${error}'); }
+  logGroupEnd() { }
+
+
   @override
   final attrToPropMap = const {
     'innerHtml': 'innerHTML',

modules/angular2/src/dom/parse5_adapter.ts

@@ -47,6 +47,12 @@ export class Parse5DomAdapter extends DomAdapter {
 
   logError(error) { console.error(error); }
 
+  log(error) { console.log(error); }
+
+  logGroup(error) { console.log(error); }
+
+  logGroupEnd() {}
+
   get attrToPropMap() { return _attrToPropMap; }
 
   query(selector) { throw _notImplemented('query'); }