synthetic_data: Created to generate synthetic data for tests.
__init__: Imported synthetic_data and added to __all__.
synthetic_data: Added the function generate_hypersphere_masks, which will generate several spheres of some common dimensionality and embeds them into a stack of masks.
synthetic_data: Added the function generate_gaussian_images, which generates a stack of gaussian images.
synthetic_data: Added the function generate_random_bound_points, which generates a list of points bound within the given space plus some additional radius for each point.
test_advanced_image_processing: Added test for wavelet_denoising from advanced_image_processing. This fixes #113.