Upgrading to EOdal version 0.1.0

[lukasValentin]

This pull requests will introduce new features and bugfixes required for generating the release of E:earth_africa:dal version 0.1.0.

Overview of the most important changes:

• Added: RasterCollection objects are now iterable (iterate over bands in collection)
• Added: RasterCollection now have a "apply" method allowing to pass custom functions to RasterCollection objects
• Added: RasterCollection now supports numpy-array like slicing using band names or band aliases
• Added: Band and RasterCollection objects now support clipping to rectangular bounds (i.e., spatial sub-setting)
• Changed: Band.reduce() and RasterCollection.band_summaries() now support creating statistics per Polygon features
• Added: SceneCollections are collections of 0 to N Scenes (RasterCollection + timestamp) and allow to store multiple Scenes over time
• Fixed: Map algebra now also works on RasterCollection supporting multiple cases (i.e., RasterCollection with other RasterCollection, scaler, etc.)
• Added: SceneCollection objects can be saved as pickled objects and loaded from pickled binary objects to make SceneCollections persistent