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image_generators.py inherits from keras-preprocessing (#131)

* flip_axis, random_channel_shift, and transform...offset_center all available in keras_preprocessing

* add keras-preprocessing as dependency and update tensorflow to 1.11.0

* update generators to use keras-preprocessing as super class and removed transform_matrix_offset_center and custom standardize

* improve image generator test coverage and speed

* prefer using keras.backend functions over tf functions

* zca_whitening fails on SampleGenerators and MovieGenerator, while brightness_range fails on channels_first

* fixed test_dilated_max_pool_3d name

* updated kernel to a Weight, and added W as layer weights

* changed post-processing for deepcell notebooks

* using K._to_tensor to instead of custom function

* support tf versions 1.8 and on

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