Fix rank filter kernels
Wrap code at 80
Move the virtual framebuffer to top level yaml
Merge pull request #1268 from pratapvardhan/morph-selem

Remove unused import and add module docstring
Merge pull request #1267 from blink1073/fix-travis-retry

Travis-CI: launch the virtual framebuffer from the top level yaml
Fix handling of imgnum
Fix handling of multi-image gifs and add test
Reinstate run_module_suite in test_pil
Fix file indexing in ImageCollection
Fix handling of singleton frames in pil_to_ndarray
Merge pull request #1263 from blink1073/fix-load-imgnum

Fix handling of img_num in PIL Plugin
Test all modules (including underscores), and always doctest
Use the test arguments from skimge.test_verbose
Update test args for command line
Do not use importlib in tifffile_local to avoid warnings
Improved docstring
Merge pull request #1269 from blink1073/test-all-modules

Test all modules (including those starting with underscores), and always doctest on Travis
Beef up docstring
Add tests for all rank filters and reformat code
Increase timeout to install requirements