* Converted scipy.misc to cv2

Scipy.misc is being deprecated so we should probably switch to OpenCV to reduce the number of needed dependencies.

* Removed unused import.

* Made Travis happy

* Travis fix

* Added cv2 dummy func and remove grayscale hack

* humanize time delta into a proper format rather than 48964518 sec.

* remove 3rd party dependency

* handle non-integer cases

* add documentation

* proper named function

* use datetime.timedelta

* a simple generic unction to visualize tensors allowing the copy-past
in other examples

* PrintData was buggy

This fixes the output order of PrintData and supports a constrained
recursion to inspect nested objects. Further, it supports more types
and keeps the output minimal by providing only necessary information
(no shape information for scalars).

* fix doc

* cleanup

* add NVML binding

* fix flake8

* separate gpu and nvml

* remove stuff

* switch to context

* Clean-up and rename

* fix lint

* Use tflayers

* some docs

* Use decorator for argument renaming

* rename parse_args

* Increase GPU counting robustness

Added native Tensorflow method to check number of GPUs.

* docs

* missing import

* fix import