Add "known issue" for quantities sometimes losing their units
Clarify that issue propagates to more complex functions in numpy and scipy
Move the binary installer background images to a new 'static' directory at the root of the source code for containing miscellaneous static files that do not necessarily have to live directly in the root of the project.
Merge pull request #1946 from embray/static-files

Move the binary installer background images to a new 'static' directory
Merge pull request #1960 from mdboom/wcs/sub-segfault

segmentation fault for astropy.wcs.Wcsprm.sub()
Use single import in example (instead of two imports with a semicolon)
Follow PEP8 and split the import over two lines
And line numbers in example still makes sense
Merge pull request #1937 from mhvk/quantity-known-issues

Add "known issue" for quantities sometimes losing their units
Test code with both unicode_literals and without
Allow testing packages that don't have a doc section.
First pass at resolving issues when testing with/without unicode_literals