Add licence headers where missing (dart-archive/coverage#207)

Some files were missing copyright headers.

Author: cbracken

pkgs/coverage/bin/run_and_collect.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
 import 'dart:async';
 
 import 'package:coverage/src/run_and_collect.dart';

pkgs/coverage/lib/coverage.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
 library coverage;
 
 export 'src/collect.dart';

pkgs/coverage/lib/src/formatter.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
 library coverage.formatter;
 
 import 'dart:async';

pkgs/coverage/lib/src/hitmap.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
 library coverage.hitmap;
 
 import 'dart:async';

pkgs/coverage/lib/src/resolver.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
 library coverage.resolver;
 
 import 'dart:async';

pkgs/coverage/test/resolver_test.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
 import 'package:coverage/src/resolver.dart';
 import 'package:test/test.dart';
 

pkgs/coverage/test/test_all.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
 import 'package:test/test.dart';
 
 import 'collect_coverage_api_test.dart' as collect_coverage_api;