[DATA] Introduce new RebatchDataset to replace rebatch and rectify

[2sin18]

This patch fixes indices alignment issues of rebatch and rectify, closes #97 #107

Rebatching Benchmark Results:

Dataset	unbatch+batch	rebatch	speedup
taobao	8080.07 samples/sec	126529.92 samples/sec	15.66x
criteo	23376.31 samples/sec	2827035.27 samples/sec	120.94x

Row-wise Shuffling Benchmark Results (Preparing time in unbatch+shuffle+batch not included):

Dataset	unbatch+shuffle+batch	shuffle_rebatch	speedup
taobao	5928.07 samples/sec	25841.40 samples/sec	4.36x
criteo	11643.74 samples/sec	32840.11 samples/sec	2.82x

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Test Results

  75 files    75 suites   5m 25s :stopwatch: 108 tests 108 :heavy_check_mark:   0 :zzz: 0 :x: 324 runs  234 :heavy_check_mark: 90 :zzz: 0 :x:

Results for commit 3a41fbe5.