Samsung keyboard has this built in, and their emoji don't look like it was design by retards (Google emoji do).
Long press microphone. Icon is obvious.
They need a Setting to configure the emoji to show there instead of the microphone, IMO.
Emoji on Samsung devices with JB+ or any 4.4 device do not and should not depend on specific apps or app plug-ins being used. You don't need a 3rd party app for that.
If you're using Google Keyboard from before the update and they aren't showing up, Uninstaller it and reinstall the keyboard from Play Store.
Sent from my Galaxy Note 3 using Tapatalk