style(dart/transform): Remove src from library directives

Conform to Angular 2 style by removing `src` from library directives.
Completed with:
```
find -name "*.dart" | xargs sed -i -e 's!library\(.*\)src\.\(.*\)!library \1\2!'
```

Closes #1005

Closes #1038

modules/angular2/src/transform/reflection_remover/ast_tester.dart

@@ -1,4 +1,4 @@
-library angular2.src.transform.reflection_remover.ast_tester;
+library angular2.transform.reflection_remover.ast_tester;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';

modules/angular2/src/transform/reflection_remover/codegen.dart

@@ -1,4 +1,4 @@
-library angular2.src.transform.reflection_remover.codegen;
+library angular2.transform.reflection_remover.codegen;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:barback/barback.dart';

modules/angular2/src/transform/reflection_remover/remove_reflection_capabilities.dart

@@ -1,4 +1,4 @@
-library angular2.src.transform.reflection_remover.remove_reflection_capabilities;
+library angular2.transform.reflection_remover.remove_reflection_capabilities;
 
 import 'package:analyzer/analyzer.dart';
 

modules/angular2/src/transform/reflection_remover/rewriter.dart

@@ -1,4 +1,4 @@
-library angular2.src.transform.reflection_remover.rewriter;
+library angular2.transform.reflection_remover.rewriter;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:angular2/src/transform/common/logging.dart';

modules/angular2/src/transform/reflection_remover/transformer.dart

@@ -1,4 +1,4 @@
-library angular2.src.transform.reflection_remover.transformer;
+library angular2.transform.reflection_remover.transformer;
 
 import 'dart:async';
 import 'package:angular2/src/transform/common/logging.dart' as log;