This is a maintenance release with minimal affect to the distribution files.

Highlights

• Better file commenting and standardization. Consistent spaces between selectors and their nested children.
• Only one changed here affects the CSS distribution files, that is to stop outputting sourcemap version comments in tent.css. Sourcemaps should only be detected locally and not in the Tent CSS repository.
• Removed 02_tools/_grid_calc.scss. There is no current intention to use this file so it is only littering the source with it's current existence.