Release 0.4.2 (2016-12-02)

Baseline: 6331a94

Cherry picks:
   + 7b835d9: Do not patch WORKSPACE in the release process

Incompatible changes:

  - Callback functions in Skylark no longer support the cfg
    parameter. This is a cleanup and only affects the signatures of
    callbacks, since the parameter hasn't been set since September
    2016.

Important changes:

  - Alias proto_library's produce a descriptor set that contains all
    srcs of its dependencies.
  - proto_library supports strict proto deps.
  - Top level @AndroidSDK support library targets have been replaced
    by @androidsdk//<group id>:<artifact id>-<version> for Android
    SDK Support and Google Play Services libraries.

CHANGELOG.md

@@ -1,12 +1,10 @@
-## Release 0.4.2 (2016-11-30)
+## Release 0.4.2 (2016-12-02)
 
 ```
-Baseline: 2a26c3c
+Baseline: 6331a94
 
 Cherry picks:
-   + a79581e: Add gpu compile support to MSVC wrapper script
-   + 4c67807: Improve reliability/performance of Bazel downloads
-   + ed7ced0: Support multiple mirror URLs for external repos
+   + 7b835d9: Do not patch WORKSPACE in the release process
 ```
 
 Incompatible changes:
@@ -18,27 +16,9 @@ Incompatible changes:
 
 Important changes:
 
-  - Prevent spurious recompiles, e.g. with changing --test_arg.
-  - proto_library now produces a descriptor set, when built on the
-    command-line.
-  - Add ctx.coverage_instrumented function to Skylark, to indicate
-    whether a specific targets should be instrumented for code
-    coverage data collection.
-  - Use --loading_phase_threads to control the number of threads used
-    during the loading/analysis phase.
-  - Structs in Skylark are tested for structural equality instead of
-    reference equality.
-  - Skylark implementations of http_archive, new_http_archive, and
-    http_file.
-  - Labels like "@foo//:foo" can now be written as "@foo" in build
-    files
   - Alias proto_library's produce a descriptor set that contains all
     srcs of its dependencies.
-  - External downloads now retry with exponential backoff and support
-    gzip content-encoding.
   - proto_library supports strict proto deps.
-  - A urls attribute has been added to repository rules to support
-    multiple mirror URLs for reliably downloading files.
   - Top level @androidsdk support library targets have been replaced
     by @androidsdk//<group id>:<artifact id>-<version> for Android
     SDK Support and Google Play Services libraries.