Added failing tests for moving and copying folderish objects.
Added fix for moving and copying error when source is folderish. Updated changelog.
Merge pull request #96 from pingviini/pingviini-fix-folder-move-and-copy

Pingviini fix folder move and copy
examples on how to write Sphinxy docstrings
fix test_copy tests as they were clearly badly copy/pasted
Rename is now independent function used by copy and move functions when
needed.