message: docs: update DEVELOPER.md with the node and yarn info
  I intentionally removed version numbers so that we don't need to update them in this file -
  because we usually forget.
  PR Close
diff: @@ -21,16 +21,16 @@ following products on your development machine:
  [Windows](http://windows.github.com)); [GitHub's Guide to Installing
  Git](https://help.github.com/articles/set-up-git) is a good source of information.
  -* [Node.js](http://nodejs.org), (version `>=6.9.5 <7.0.0`) which is used to run a development web server,
  - run tests, and generate distributable files. We also use Node's Package Manager, `npm`
  - (version `>=3.10.7 <4.0.0`), which comes with Node. Depending on your system, you can install Node either from
  - source or as a pre-packaged bundle.
  +* [Node.js](http://nodejs.org), (version specified in the engines field of [`package.json`](../package.json)) which is used to run a development web server,
  + run tests, and generate distributable files.
  -* [Yarn](https://yarnpkg.com) (version `>=1.0.2 <2.0.0`) which is used to install dependencies.
  +* [Yarn](https://yarnpkg.com) (version specified in the engines field of [`package.json`](../package.json)) which is used to install dependencies.
  * [Java Development Kit](http://www.oracle.com/technetwork/es/java/javase/downloads/index.html) which is used
  to execute the selenium standalone server for e2e testing.
  +* (Optional for now) [Bazel](https://bazel.build/), please follow instructions in [Bazel.md]
  +
  ## Getting the Sources
  Fork and clone the Angular repository:
  @@ -61,19 +61,11 @@ Next, install the JavaScript modules needed to build and test Angular:
  yarn install
  ```
  -**Optional**: In this document, we make use of project local `npm` package scripts and binaries
  -(stored under `./node_modules/.bin`) by prefixing these command invocations with `$(npm bin)`; in
  -particular `gulp` and `protractor` commands. If you prefer, you can drop this path prefix by either:
  -
  -
  -## Installing Bower Modules
  +**Optional**: In this document, we make use of installed npm package scripts and binaries
  +(stored under `./node_modules/.bin`) by prefixing these command invocations with `$(yarn bin)`; in
  +particular `gulp` and `protractor` commands.
  -Now run `bower` to install additional dependencies:
  -```shell
  -# Install other Angular project dependencies (bower.json)
  -bower install
  -```
  ## Windows only
  