merge master (PaddlePaddle#110)

* fused_seqpool_cvm_with_conv support filter by threshold

* add fill zero in fused_seqpool_cvm

* add fused seq tensor && support transpose batch fc weight

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Co-authored-by: mojingcj <ChengJing_dhu@163.com>
Co-authored-by: jiaoxuewu <jiaoxuewu@163.com>
Co-authored-by: yuandong1998 <1377526365@qq.com>
Co-authored-by: shangzhongbin <shangzhongbin@baidu.com>