Add deactivate account function

lib/base-apis.js

@@ -128,6 +128,28 @@ MatrixBaseApis.prototype.logout = function(callback) {
     );
 };
 
+/**
+ * Deactivates the logged-in account.
+ * Obviously, further calls that require authorisation should fail after this
+ * method is called. The state of the MatrixClient object is not affected:
+ * it is up to the caller to either reset or destroy the MatrixClient after
+ * this method succeeds.
+ * @param {object} auth Optional. Auth data to supply for User-Interactive auth.
+ * @param {module:client.callback} callback Optional.
+ * @return {module:client.Promise} Resolves: On success, the empty object
+ */
+MatrixBaseApis.prototype.deactivateAccount = function(auth, callback) {
+    var body = {};
+    if (auth) {
+        body = {
+            auth: auth,
+        }
+    }
+    return this._http.authedRequestWithPrefix(
+        callback, "POST", '/account/deactivate', undefined, body, httpApi.PREFIX_UNSTABLE
+    );
+};
+
 
 // Room operations
 // ===============