Add support for alwaysScroll instance option
Add support for alwaysScroll instance option

Allow use of an alwaysScroll instance option to force the scroller to
always allow scrolling/bouncing, even if there would be insufficient
content to normally trigger scrolling.  Roughly equivalent to changing
overflow: auto to overflow: scroll.

ftlabs/ftscroller,realyze/ftscroller_gsap_test,npmcomponent/ftlabs-ftscroller