small improvements (#2217)
small improvements (#2217)

* Add initial scroller without options
* Add initial scroll without an option
* Add verticalScroll option
* Fix scrollbar positions
* Add docs
* fix example
* remove jquery dependency
* Fix example
* Fix review comments
* Fix verticalScroll and horizontalScroll docs
* Fix bug in timeline option.rtl if otion is undefined
* Remove hack

Tooa/vis,yotamberk/vis,marcortw/vis,Tooa/vis,yotamberk/vis,marcortw/vis