rename with execution order, add desc & initial creation script

tools/migration/shell.1487734995.user-profile.js

@@ -0,0 +1,18 @@
+db.users.find({}).forEach(function(user) {
+	print(user._id);
+	db.users.update({ _id: user._id }, {
+		$rename: {
+			bio: 'description'
+		},
+		$unset: {
+			location: '',
+			birthday: ''
+		},
+		$set: {
+			profile: {
+				location: user.location || null,
+				birthday: user.birthday || null
+			}
+		}
+	}, false, false);
+});