Fix Drawer can be over-offset (PureWriter#3)

* Bump to 1.0.1

Add support for other kinds of drawer (PureWriter#2)

Add a `FullDraggableHelper` to hold the reusable part so that we can use it for other kinds of drawers.

* Make _drawerlayout_ as an optional and `compileOnly` dependency
* Rename `dismissDrawer` to `smoothCloseDrawer`
* Bump to 1.0.0

Add maven support and update README