With the HTTPS env var set 'true', the dev server will serve over HTTPS.

* Disable contentBase in development

* Document #428

env.js is only for variables injected into the app.

Fixes: #253

tagging dev-only code (@remove-on-publish-begin/end) and pre-eject-only code (@remove-on-eject-begin/end) #257 (#257)

* Document testing

* Update README.md

* Update README.md

* Clarify our recommendations on testing

* Okay, that was too much. :-)

* Add a few more things

This makes generators work with Jest.

Fixes #255.
Replaces #262.

Disabled because of issues:
 * https://github.com/facebookincubator/create-react-app/issues/525
 * https://phabricator.babeljs.io/search/query/pCNlnC2xzwzx/

TODO: Enable again when these issues are resolved.

Fixes #532

* Update Jest

* Remove default snapshot test

* Fix a few things

* Add a simple default test

* App.spec.js -> App.test.js

* Fix e2e test

* Bump Jest

* Add a more prominent link to the guide

As a contributor, I know where to find the documentation/guide since
know the codebase, but I've seen people miss the link to it in the
README, because it's not very prominent. Let's try to make it more
discoverable by including a link to it right on top of the page.

* Make the wording of links more obvious

* Rename the "How Do I...?" section to "User Guide" for consistency

* ignore .idea folder
this change is requred for IntelliJ-based products because project information files are written before actual generator is invoked

* better method name and explanation