refactor: simplify and make tests work in JS and Dart

* remove `wraps` syntax enhancements for imports
  and support new `import * as module from ...` syntax

  - default imports are the wrong construct for importing
    everything from a module

* moved tests from transpiler to jasmine and karma

  - transpiler tests are included when running karma in main project folder
  - transpiler is reloaded after every test run in karma,
    so no need to restart karma when the transpiler has been changed.
  - removed own gulp build for transpiler and `postinstall.sh`
    as they are no more needed.
  - transpiler tests are now executed in Dart AND JavaScript (used to be executed
    only in Dart), which allowed to catch some bugs (see the bug with the
    import specification above).

* made tests work in dart as well by using the following hack:

  - dependencies are loaded from the `build` folder, which makes
    running `gulp build` necessary before running karma for dart
  - for this to work,
    the dependencies are included in main `pubspec.yaml` of project
  - reason for the hack: `karma-dart` loads all `packages` urls
    directly from disc (should rather use the karma file list)

* added explicit annotations `FIELD`, `ABSTRACT`, ... to `facade/lang.*`

  - needed for now that we can run tests and don't get errors for undefined
    annotations.

* added `README.md` with details about the build and tests

modules/change_detection/pubspec.yaml

@@ -5,3 +5,5 @@ dependencies:
 dev_dependencies:
   test_lib:
     path: ../test_lib
+  facade:
+    path: ../facade

modules/change_detection/src/change_detection.js

@@ -1,5 +1,6 @@
 import {WatchGroup} from './watch_group';
 import {Record} from './record';
+import {FIELD} from 'facade/lang';
 
 export class ChangeDetection {
 

modules/change_detection/src/record.js

@@ -1,4 +1,5 @@
 //import {ProtoWatchGroup, WatchGroup} from './watch_group';
+import {FIELD} from 'facade/lang';
 
 export class ProtoRecord {
 
@@ -53,28 +54,28 @@ export class ProtoRecord {
 
 /**
  * Represents a Record for keeping track of changes. A change is a difference between previous
- * and current value. 
- * 
+ * and current value.
+ *
  * By default changes are detected using dirty checking, but a notifier can be present which can
  * notify the records of changes by means other than dirty checking. For example Object.observe
  * or events on DOM elements.
- * 
- * DESIGN NOTES:  
- *  - No inheritance allowed so that code is monomorphic for performance. 
+ *
+ * DESIGN NOTES:
+ *  - No inheritance allowed so that code is monomorphic for performance.
  *  - Atomic watch operations
  *  - Defaults to dirty checking
  *  - Keep this object as lean as possible. (Lean in number of fields)
- * 
+ *
  * MEMORY COST: 13 Words;
  */
 export class Record {
-  
+
   @FIELD('final watchGroup:WatchGroup')
   @FIELD('final protoRecord:ProtoRecord')
   /// order list of all records. Including head/tail markers
   @FIELD('_next:Record')
   @FIELD('_prev:Record')
-  /// next record to dirty check 
+  /// next record to dirty check
   @FIELD('_checkNext:Record')
   @FIELD('_checkPrev:Record')
   // next notifier
@@ -120,7 +121,7 @@ export class Record {
     var notify = mode & MODE_MASK_NOTIFY;
     var currentValue;
     switch (state) {
-      case MODE_STATE_MARKER: 
+      case MODE_STATE_MARKER:
         return false;
       case MODE_STATE_PROPERTY:
         currentValue = this._getter(this._context);
@@ -136,7 +137,7 @@ export class Record {
     }
     var previousValue = this.previousValue;
     if (isSame(previousValue, currentValue)) return false;
-    if (previousValue instanceof String && currentValue instanceof String  
+    if (previousValue instanceof String && currentValue instanceof String
         && previousValue == currentValue) {
       this.previousValue = currentValue;
       return false
@@ -178,4 +179,4 @@ function isSame(a, b) {
   } else {
     return false;
   }
-} 
+}

modules/change_detection/src/watch_group.js

@@ -1,4 +1,5 @@
 import {ProtoRecord, Record} from './record';
+import {FIELD} from 'facade/lang';
 
 export class ProtoWatchGroup {
   @FIELD('final _headRecord:ProtoRecord')