This reverts commit d2241fc.

See prettier#3213 (comment)

* Revert "Revert "Respect EditorConfig settings" (#3213)"

This reverts commit d2241fc.

* Comment out EditorConfig docs

See #3213 (comment)

* editorconfig: Support `indent_size = 0`

See #2760 (comment)
and josephfrazier/editorconfig-to-prettier@c38b84c

* Revert "Comment out EditorConfig docs"

This reverts commit ddfa529.

* Mark EditorConfig functionality as v1.9.0+

See #3255 (comment)

* editorconfig: Upgrade editorconfig-to-prettier to 0.0.4

* editorconfig: Only enable for CLI, by default

#3255 (comment)

* editorconfig: Add tests confirming that editorconfig is ignored by default in the API

#3255 (comment)

* editorconfig: Add/fix CLI option parsing

* editorconfig: Move docs from configuration.md to options.md

* editorconfig: Add `oppositeDescription` to show docs for `--no-editorconfig`

Addresses #3255 (comment)

* editorconfig: Update test snapshots

* editorconfig: Remove unnecessary options parsing code

Addresses #3255 (comment)

* editorconfig: Move docs from options.md to api.md and cli.md

Addresses #3255 (comment)

* resolveConfig: return null if both .prettierrc and .editorconfig are missing

Addresses #3255 (comment)

* Don't add now-failing tests

The way these tests work, both `tests_integration/cli/config/.prettierrc`
and `.prettierrc` apply to `tests_integration/cli/config/editorconfig/file.shouldnotexist`,
so the test wouldn't work even on master. Here's a way to confirm that:

```js
const path = require('path')
const assert = require('assert')
const prettier = require('./')

const file = './tests_integration/cli/config/editorconfig/file.shouldnotexist'
console.log(prettier.resolveConfig.sync(file))
assert(prettier.resolveConfig.sync(file) === null)
```