Per final comment in #372

`Snapshot rendering should actually be pretty stable / useable after React 15.4.1.
See this post for more info.`

* Added Rails link to User Guide

* docs: unify sections for rails and node backend integration

* docs: fix faulty link and indentation

* Add causes of dev server not detecting changes

Add causes of `npm start` not detecting changes to Troubleshooting chapter of User Guide

* Reworded slightly

* Update README.md

for consistency :)

* Use a more sophisticated template for end-to-end testing.

* Not publish integration tests to npm

* Use "commander" for  cli argv handling

* Handle different scripts version forms and exits without a name given

* Prepare the commands for testing with a template

* Fix dev "template" path

* Add various features to test

* Test various features separately

* Test language features

* Comment unused e2e.sh lines

* Add "development" tests

* Test environment variables

* Test webpack plugins

* Replace kitchensink README

* Switch integration tests from jest to mocha

* Use `fs-extra`

* Use the correct folders

* Do some cleanup

* Print a better message for `--template`

* Test `npm start` with and without https

* Separate fast e2e testing from kitchensink testing

* Hide `--internal-testing-template` (former `--template`) CLI option

* Document Flow support

Projects created by Create React App use the `babel-preset-react` which includes
Flow babel plugins which introduces new syntax. This is important for users to know
as it causes what used to be syntax errors to be silently suppressed because they're
valid type annotations in Flow. For example if a user accidentally has `[foo: 'bar']`,
Babel will silently convert it to `[foo]`.

* Make it a bit clearer

Array.forEach is passed the following parameters:

currentValue
    The current element being processed in the array.
index
    The index of the current element being processed in the array.
array
- https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach

console.log takes multiple arguments. We only want to print the first one, the actually message.

0.8.5

 - create-react-app@1.0.3
 - react-scripts@0.8.5

There’s a common tool included in Hadoop that also has a `yarn` command,
which created issues for users who had Hadoop installed:
* #1257
* #1363

Yarn also installs the command under `yarnpkg` alias (added in
https://github.com/yarnpkg/yarn/commit/cefa9a368dd3df1a1f1ecd9e50de9c5fabefbc92)
so we can use `yarnpkg` instead of `yarn` to make it more reliable.

This has no effect on users who don't have Hadoop installed, but those
who have won't see errors from falsely detecting Hadoop Yarn as Yarn
the package manager, and they can now also install Yarn to make use of
our Yarn support without the Hadoop Yarn interfering.

There’s a common tool included in Hadoop that also has a `yarn` command,
which created issues for users who had Hadoop installed:
* #1257
* #1363

Yarn also installs the command under `yarnpkg` alias (added in
https://github.com/yarnpkg/yarn/commit/cefa9a368dd3df1a1f1ecd9e50de9c5fabefbc92)
so we can use `yarnpkg` instead of `yarn` to make it more reliable.

This has no effect on users who don't have Hadoop installed, but those
who have won't see errors from falsely detecting Hadoop Yarn as Yarn
the package manager, and they can now also install Yarn to make use of
our Yarn support without the Hadoop Yarn interfering.

* gh-1269: Enabling nested folder paths for project name

* gh-1269: Added "fs-extra" and removed "path-exists"

* gh-1269: Added e2e test cases to verify nested folder names

Browser launch can still be suppressed using BROWSER=none

* Adds note on how to resolve file or directory not found errors for heroku deployments

* Style tweaks

* Add "Changing the Page Title" to User Guide

* Add link to main README

Use a 'BROWSER' environment variable with npm start to specify which
browser to open. if the value of 'BROWSER' is not valid executable file,
don't open any browser.

 - create-react-app@1.0.2
 - react-dev-utils@0.4.2
 - react-scripts@0.8.4

* Tweak minimal Node error message

* Tweak console messages

* It doesn't need to be from npm

* Try to fix e2e test