Bulleted list of usage guidelines on 'price', links to GS1 on gtin* properties.
Improved examples for price, added an example to property page.
Simplified wording, linked RDFa spec.
Cleaned $ from price examples, added priceCurrency properties.
Restored subClassOf CreativeWork for Blog type.
Merge branch 'master' into sdo-postsemtech
Bumping version number to v1.91.
Merge branch 'master' into sdo-postsemtech
Removing "A sub property of ..." since navigation says that.
Restored truncated text.
Thanked OpenDomain, rather belatedly.
Better URL for GTIN at GS1.
Added more GTIN-related background links.
Updating release notes for v1.91.
Merge pull request #117 from danbri/sdo-postsemtech

v1.91 updates collected