Add full guild emoji functionality (#749)

* all the emoji stuff

* fix things for hydra 😘

* feck i need to stop committing on github

* update docs again

* Butts

src/client/actions/GuildEmojiCreate.js

@@ -0,0 +1,18 @@
+const Action = require('./Action');
+
+class EmojiCreateAction extends Action {
+  handle(data, guild) {
+    const client = this.client;
+    const emoji = client.dataManager.newEmoji(data, guild);
+    return {
+      emoji,
+    };
+  }
+}
+
+/**
+ * Emitted whenever an emoji is created
+ * @event Client#guildEmojiCreate
+ * @param {Emoji} emoji The emoji that was created.
+ */
+module.exports = EmojiCreateAction;