Basic Bazel support for Emacs

For now this mode gives you python syntax highlighting for WORKSPACE, BUILD.bazel and .bzl files. Formatting is supported by running buildifier.

Buildifier needs Go to compile and install. Follow the directions in [1] or install by running the following command.

go get -u github.com/bazelbuild/buildtools/buildifier

[1] https://github.com/bazelbuild/buildtools/blob/master/buildifier/README.md

C-c C-f runs bazel-format on the current buffer.

Add the following to your Emacs config.

(add-hook 'bazel-mode-hook (lambda () (add-hook 'before-save-hook #'bazel-format nil t)))