Add make_gaussian_sources
Add make_random_gaussians
Add Possion noise option
Doc improvements to new make_* functions
Add option to return table of random sources
Remove make_gaussian_image
Allow amplitude or flux inputs
Add test for make_gaussian_image
Return table from make_random_gaussians
Add x/ystddev_range
Add check_random_state from scikit-learn
Use check_random_state
Add discretize_model methods
Add make_noise_image
Use oversample discretization
Add apply_poisson_noise
Raise error in stddev is None
Add tests for new datasets functions
Merge pull request #146 from larrybradley/make_gaussians

Add new functions to make images with Gaussian sources