Update README.md

Typo fix.
restored default prevention in the tap/click/arrow key handler. This fixes two issues: 1) touch browsers were advancing 2 slides on tap, and 2) the sidescroller was scrolling the page to top after a click on the arrows.
bump to 0.6.3 with bugfix
update dist files
prevent re-initialization on a sidescroller
ensuring that the sidescroller onEvent callback objects are the same across both event models.
bump to 0.6.4
update built files
added a test page with 2 carousels to ensure no controls are leaking across them