* Gfycat integration

* Added headers to resolve make check-style.

* Updated tests.

* Removed gfycat analytics.

* Added '(Beta)' to GIF system console.

* Added gfycat API credentials to admin console.

* Removed gfycatSdk.

* Only enable gif picker if gfycat credentials are specified.

* Updated gfycat credentials description on admin console.

* Ran check-style.

* Revert check for gfycat api credentials.

* Updated package.json to latest redux commit.

* Deleted unused stylesheets.

* Changed Components to PureComponents.

* Re-added emoji preview which might have been removed from merge conflict.

* Fixed make check-style errors.

* Minor updates to Gfycat System Console text

* Add missing strings to en.json

* Use image proxy.