Added setting permissions

You should just do:

permissionObject.manageRoles = true;

for example rather than messing with setBit.

lib/ChannelPermissions.js

@@ -59,7 +59,16 @@ var ChannelPermissions = (function () {
 		return (this.packed >>> x & 1) === 1;
 	};
 
-	ChannelPermissions.prototype.setBit = function setBit() {};
+	ChannelPermissions.prototype.setBit = function setBit(location, value) {
+
+		if (value) {
+			// allow that permission
+			this.packed |= 1 << location;
+		} else {
+			// not allowed
+			this.packed &= 1 << location;
+		}
+	};
 
 	_createClass(ChannelPermissions, [{
 		key: "createInstantInvite",