Add new datasets, new models, and dataset utilities.

v0.1.4

Added

• FilteredMetaDatasest filter the classes used to sample tasks.
• UnionMetaDatasest to get the union of multiple MetaDatasets.
• Alias MiniImageNetCNN to CNN4 and add embedding_size argument.
• Optional data augmentation schemes for vision benchmarks.
• l2l.vision.models.ResNet12
• l2l.vision.datasets.DescribableTextures
• l2l.vision.datasets.Quickdraw
• l2l.vision.datasets.FGVCFungi
• Add labels_to_indices and indices_to_labels as optional arguments to l2l.data.MetaDataset.

Changed

• Updated reference for citations.