TST: add tests for image generation, fix bug with supported Cairo image types #11
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Resolves #6
Tests the image integrity, image format, image size and image colour mode for generated images.
Due to randomness in the generation, I don't believe the contents of the image cannot be checked much further.
Also changes the supported image types for visualise. The Cairo library does not support
.jpgimages for instance. Images have been restricted to["png", "eps", "pdf", "svg"].pillowcannot read.pdfor.svgimages so for those two types the tests merely check that the files are not empty.Let me know if there's anything else!