Site tagline is the default sub header on top level pages
Add docblock for spine_get_main_header()
Provide a default for the spine header_global option
If a global override is chosen, use that as the default sup/sub
Document default behavior, remove duplicate use of spine_section_meta()
Additional documentation of the front page logic
Theme is currently tagged as 0.9.11, bump script versions to match
Setup blank meta box for pages to override spine sup and sub headers
Add form to accept sup header and sub header overrides
Save the sup and sub header meta if it exists for pages
Merge pull request #67 from washingtonstateuniversity/update/tag-title-meta

[PR] Update default handling of sup and sub headers