Move `analyzer_cli` into the SDK.

pkg/analyzer_cli/CONTRIBUTOR.md

Index: pkg/analyzer_cli/CONTRIBUTOR.md
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+# Contribute to dartanalyzer
+
+To _use_ the dartanalyzer command-line tool, see the 
+[user docs](https://github.com/dart-lang/analyzer_cli/blob/master/README.md#analyzer_cli). 
+This page contains information relevant for contributors to dartanalyzer.
+
+## Can I help?
+
+Yes!
+
+Start by [using the tool](README.md) and filing issues and requests.
+
+See the interface for the Dart `analyzer` library 
+[package](https://pub.dartlang.org/packages/analyzer).
+
+If you want to contribute, check out the
+[issue tracker](https://github.com/dart-lang/analyzer_cli/issues).
+If you want to add a new feature that's not yet in the issue tracker,
+start by opening an issue. Thanks!
+
+[![Build Status](https://travis-ci.org/dart-lang/analyzer_cli.svg)](https://travis-ci.org/dart-lang/analyzer_cli)
+[![Build status](https://ci.appveyor.com/api/projects/status/48jv262mnbohjb9m?svg=true)](https://ci.appveyor.com/project/sethladd/analyzer-cli)
+[![Coverage Status](https://coveralls.io/repos/dart-lang/analyzer_cli/badge.svg)](https://coveralls.io/r/dart-lang/analyzer_cli)
+
+## Features and bugs
+
+Please file feature requests and bugs at the [issue tracker][tracker].
+
+[tracker]: https://github.com/dart-lang/analyzer_cli/issues
+
+## License
+
+Please see the [dartanalyzer license](https://github.com/dart-lang/analyzer_cli/blob/master/LICENSE).