fix wrapping strip missing clones on re-render
Merge commit '15492af736a1ed616179e62481150bb06776c384' into v2carousel
Modify currentIndex on navigator to return null when no current index (rather then -1) to help catch errors earlier.
Merge pull request #87 from fmtvp/v2carousel

V2carousel - travis failed but testing pass locally. also failing tests are no related to new code