* Revert "Add ES5 version of `path-exists` to CLI"

This reverts commit fc3ab46d.

* Use pre node@4 compatible `path-exists`

Ref #617

* Check the app name before proceeding.

* Refactor.

* Use arrow function and template string.

* Remove comment.

* Rephrase the error.

* Add missing semicolons.

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

* 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

According to the official SemVer FAQ, versioning should start at 0.1.0 (http://semver.org/#how-should-i-deal-with-revisions-in-the-0yz-initial-development-phase)

* Creating a new app in the current directory

* Fixed style mistakes

Summary:

Test Plan:

Reviewers:

CC:

Task ID: #

Test Plan:

```
npm pack
node global-cli/index.js testing --scripts-version /Users/vjeux/random/react-getting-started/create-react-app-scripts-0.0.1.tgz
```

make sure it shows

```
Creating the app testing at /Users/vjeux/random/react-getting-started/testing
```