added basic tests for comparing images
fixed the tick numbers test
generated images are stored in respective directories now
put fits images in separate folder
trying to make pytest plugin
added conftest.py file
added fixture to generate images
refactored the generating and testing code
reverted back to main wcsaxes from master branch
removed make_baseline_images.py
removed reference images
updated it so it uses data from wcsaxes-datasets
removed fits data files
merged multiple tests, changed baseline images