Georeferenced datasets and web application

Some new datasets focusing on building footprint detection have been introduced
in the framework, namely Inria Aerial Image dataset and Open AI Tanzania dataset.

Some new state-of-the-art deep neural network architectures have been
implemented to enrich the existing collection, and design more sophisticated
models.

Furthermore a bunch of Jupyter notebooks has been written to make the framework
usage easier, and clarify deep learning pipelines, from dataset description to
model training and inference.

And last but not least, a light Flask Web application has been developed to
showcase some deep learning predictions. Oslandia hosts this Web app at
http://data.oslandia.io/deeposlandia.