1D Max Pooling (#1436)
1D Max Pooling (#1436)

* finish 1D pooling

* finish documentation

* meet code review

* finish 1d pooling

* meet code review

* fix scala style errors

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