Squashed commit of the following:

commit a23740f
Author: Rahul Kadyan <[email protected]>
Date:   Thu Feb 8 19:09:49 2018 +0000

    feat: allow additional properties in options (vuejs#56)

commit 833605d
Author: Rahul Kadyan <[email protected]>
Date:   Sun Jan 28 06:02:46 2018 +0000

    feat: transform require to import statements in esModule (vuejs#54)

Author: znck