add guild emoji methods (#742)

* add guild emoji methods

* run docs

* crawl pointed out some things about the docs, so i fixed

* actually run the docs on the changes 🤦

src/client/rest/RESTMethods.js

@@ -7,6 +7,7 @@ const User = requireStructure('User');
 const GuildMember = requireStructure('GuildMember');
 const Role = requireStructure('Role');
 const Invite = requireStructure('Invite');
+const Emoji = requireStructure('Emoji');
 
 class RESTMethods {
   constructor(restManager) {
@@ -516,6 +517,22 @@ class RESTMethods {
       }).catch(reject);
     });
   }
+
+  createEmoji(guild, image, name) {
+    return new Promise((resolve, reject) => {
+      this.rest.makeRequest('post', `${Constants.Endpoints.guildEmojis(guild.id)}`, true, { name: name, image: image })
+      .then(data => {
+        resolve(new Emoji(guild, data));
+      }).catch(reject);
+    });
+  }
+
+  deleteEmoji(guild, id) {
+    return new Promise((resolve, reject) => {
+      this.rest.makeRequest('delete', `${Constants.Endpoints.guildEmojis(guild.id)}/${id}`, true)
+      .then(resolve).catch(reject);
+    });
+  }
 }
 
 module.exports = RESTMethods;