Pic2vec

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* Added batch processing
* Made pic2vec more programmatic (removed automatic csv-writing, etc.)
* Bound keras to <2.1.5 to remove resnet problem

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* Fixed Keras backwards compatibility issues (include_top deprecated, require_flatten added)
* Fixed ResNet50 update issues (removed a zero-padding layer, updated weights)

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* Updated trafaret requirement for PyPi package
* Updated cats vs. dogs example

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* Fixed bugs with robust naming
* Added error message for failed image conversion

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* Added robust naming options to the generated csv files

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* Fixed PIL truncated image bug