refactor: remove unused import clauses

Author: vicb

Diff for: lib/cache/js_cache_register.dart

@@ -5,7 +5,6 @@ library angular.cache.js;
 import 'dart:js' as js;
 import 'package:di/di.dart';
 import 'package:di/annotations.dart';
-import 'package:angular/core/annotation_src.dart';
 import 'package:angular/cache/module.dart';
 
 Key JS_CACHE_REGISTER_KEY = new Key(JsCacheRegister);

Diff for: lib/cache/module.dart

@@ -1,7 +1,6 @@
 library angular.cache;
 
 import 'dart:collection';
-import 'dart:async';
 
 import 'package:di/di.dart';
 import 'package:di/annotations.dart';

Diff for: lib/change_detection/ast_parser.dart

@@ -6,7 +6,6 @@ import 'package:di/annotations.dart';
 import 'package:angular/core/parser/syntax.dart' as syntax;
 import 'package:angular/core/parser/parser.dart';
 import 'package:angular/core/formatter.dart';
-import 'package:angular/core/annotation_src.dart';
 import 'package:angular/change_detection/watch_group.dart';
 import 'package:angular/change_detection/change_detection.dart';
 import 'package:angular/core/parser/utils.dart';

Diff for: lib/core/annotation_src.dart

@@ -1,7 +1,5 @@
 library angular.core.annotation_src;
 
-import "package:di/di.dart" show Injector, Visibility, Factory;
-
 abstract class DirectiveBinder {
  void bind(key, {dynamic toValue,
                  Function toFactory,

Diff for: lib/core/module_internal.dart

@@ -10,11 +10,8 @@ import 'package:di/annotations.dart';
 
 import 'package:angular/core/parser/parser.dart';
 import 'package:angular/core/parser/lexer.dart';
-import 'package:angular/utils.dart';
 import 'package:angular/ng_tracing.dart';
 
-import 'package:angular/core/annotation_src.dart';
-
 import 'package:angular/cache/module.dart';
 import 'package:angular/change_detection/watch_group.dart';
 export 'package:angular/change_detection/watch_group.dart';
@@ -23,9 +20,6 @@ import 'package:angular/change_detection/change_detection.dart';
 import 'package:angular/change_detection/dirty_checking_change_detector.dart';
 import 'package:angular/core/formatter.dart';
 export 'package:angular/core/formatter.dart';
-import 'package:angular/core/parser/utils.dart';
-import 'package:angular/core/registry.dart';
-import 'package:angular/core/static_keys.dart';
 
 part "exception_handler.dart";
 part "interpolate.dart";

Diff for: lib/core/parser/dynamic_parser.dart

@@ -2,7 +2,6 @@ library angular.core.parser.dynamic_parser;
 
 import 'package:di/annotations.dart';
 import 'package:angular/cache/module.dart';
-import 'package:angular/core/annotation_src.dart' hide Formatter;
 import 'package:angular/core/formatter.dart' show FormatterMap;
 
 import 'package:angular/core/parser/parser.dart';

Diff for: lib/core/parser/lexer.dart

@@ -1,7 +1,6 @@
 library angular.core.parser.lexer;
 
 import 'package:di/annotations.dart';
-import 'package:angular/core/annotation_src.dart';
 import 'package:angular/core/parser/characters.dart';
 
 part 'tokens.dart';

Diff for: lib/core_dom/directive_injector.dart

@@ -1,6 +1,5 @@
 library angular.node_injector;
 
-import 'dart:collection';
 import 'dart:html' show Node, Element, ShadowRoot;
 import 'dart:profiler';
 

Diff for: lib/core_dom/static_keys.dart

@@ -3,7 +3,6 @@ library angular.core_dom.static_keys;
 import 'dart:html' as dom;
 import 'package:di/di.dart';
 import 'package:angular/cache/module.dart';
-import 'package:angular/core/static_keys.dart';
 import 'package:angular/core_dom/module_internal.dart';
 
 export 'package:angular/directive/static_keys.dart' show NG_BASE_CSS_KEY;

Diff for: lib/formatter/module_internal.dart

@@ -4,7 +4,6 @@ import 'dart:convert' show JSON;
 import 'package:intl/intl.dart';
 import 'package:di/di.dart';
 import 'package:angular/core/annotation.dart';
-import 'package:angular/core/module_internal.dart';
 import 'package:angular/core/parser/parser.dart';
 
 part 'currency.dart';

Diff for: lib/introspection.dart

@@ -7,7 +7,6 @@ import 'dart:async' as async;
 import 'dart:html' as dom;
 import 'dart:js' as js;
 import 'package:di/di.dart';
-import 'package:angular/animate/module.dart';
 import 'package:angular/core/module_internal.dart';
 import 'package:angular/core_dom/module_internal.dart';
 import 'package:angular/core_dom/directive_injector.dart' show DirectiveInjector;
@@ -231,7 +230,7 @@ _jsify(var obj) {
     return _jsFunction(obj);
   }
   if ((obj is Map) || (obj is Iterable)) {
-    var mappedObj = (obj is Map) ? 
+    var mappedObj = (obj is Map) ?
         new Map.fromIterables(obj.keys, obj.values.map(_jsify)) : obj.map(_jsify);
     if (obj is List) {
       return new js.JsArray.from(mappedObj);

Diff for: lib/transformer.dart

@@ -1,7 +1,6 @@
 library angular.transformer;
 
 import 'dart:async';
-import 'dart:io';
 import 'package:angular/tools/transformer/expression_generator.dart';
 import 'package:angular/tools/transformer/metadata_generator.dart';
 import 'package:angular/tools/transformer/static_angular_generator.dart';
@@ -10,7 +9,6 @@ import 'package:angular/tools/transformer/options.dart';
 import 'package:barback/barback.dart';
 import 'package:code_transformers/resolver.dart';
 import 'package:di/transformer.dart' as di;
-import 'package:path/path.dart' as path;
 
 
  /**