Add Guise Mummy tests for existing functionality.

Guise Mummy was built so rapidly, it is missing a lot of unit tests. Many more need to be added. Here are an example of some:

• Configuring bare file names correctly removes the extension.

• Files and directories beginning with _ are not included in navigation menus.

• Files and directories beginning with _ (veiled) are renamed to remove it, even as a segment in the middle of a path.

• Files and directories beginning with $ (assets) are also considered veiled.

• Files and directories beginning with $ (assets) result in no phantom content files being produced for directories.

• Files named with post naming conventions result in the correct subdirectory structure.

• Relocating a template to a different directory results in the correct references.

• Relocating an HTML DOM tree from the source tree to the target tree results in the correct references.

• Retargeting references work correctly for a directory content file (e.g. index.html).

• Relocated self references work.

• Links to target collection resources end in slash, even if the target directory does not exist in the source tree.

• Retrieving children of a directory content file (e.g. index.html) returns children of the directory, not including the content file.

• Retrieving siblings of a directory content file (e.g. index.html) returns siblings of the of the directory, including the directory.

• References to artifacts with i18n names are properly encoded.

• S3 resource names are properly encoded.

• S3 collection names end in slash.

• Generating a navigation list detects a self link even for subsumed artifacts such as index.html.