Med-dataloader

-------------------

* Patching is now performed with **SAME** padding

-------------------

* img_size support also None value.

-------------------

* Improved handling of img_size parameters for both 2D and 3D images.

* User can now declare img_size as a 2- or 3-elements list.

* Automatic zero-padding or center-based cropping is performed to adapt the size of the image to the declare img_size parameter.

* New features: 3D volumes can be patched into smaller cubic patches. Overlapping between patches is also supported.

-------------------

* New function: now dataset can be generated also by reading a json file containing list of file paths.

-------------------

* Fixed minor bug in function norm_with_bounds

-------------------

* Fixed support for 3D Images
* Fixed minor bugs