_scrubJulian updated in setTimeFromBuffer for czml files

Signed-off-by: Ravi Agrawal <ravi.agrwl420@gmail.com>
_scrubJulian update moved up

Signed-off-by: Ravi Agrawal <ravi.agrwl420@gmail.com>
Merge branch 'master' of https://github.com/AnalyticalGraphicsInc/cesium into timeline-scrubber
updateFromClock called inside setTimeFromBuffer
Merge pull request #674 from macoda/timeline-scrubber

_scrubJulian updated in setTimeFromBuffer for czml files