bump version to 0.7.0-SNAPSHOT (#2577)
bump version to 0.7.0-SNAPSHOT (#2577)


intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,intel-analytics/BigDL,yangw1234/BigDL