Ensure all units returned by timesince have a non-breaking space.
Special case: With multiple units, don't add non-breaking space between units.
More tests for timesince.
Fix timesince to add non-breaking spaces between units.
Add tests that test that filesizeformat adds a non-breaking space between units.
Fix filesizeformat to add a non-breaking space between value and unit.
Humanize uses timesince and therefore some of the tests need changes.
Need to specify unicode literal, otherwise we don't get the proper replace character.
Fix template tests to test the new non-breaking spaces.
Add myself to AUTHORS file :)