Remove duplicate array key in defaults
Document intent via comments - Spine Open Sans vs Open Sans Fonts
Correct new open sans flag option
Use spine_open_sans to store various Open Sans weights and styles

This makes it easier to pull all open sans options from one option
rather than parsing through the general spine options array.

If there was a high chance of offering other font choices, I would
have used spine_font_options or something similar. We can revisit
in the future if needed.
Introduce spine_get_open_sans_options
Do not enqueue the opensans.css stylesheet from repo

The option to enable open sans still adds opensansy as a class
so that the Spine framework targets styles properly. It no longer
enqueues the open sans stylesheet from repo.wsu.edu
Build the string used to pull Open Sans fonts from Google
Remove static link to Open Sans Google fonts from header template
Remove debug code from header template
Enqueue any required Google Open Sans font weights and styles