Tweaks to documentation to handle extensions. Moved draft list of extensions into schemas.html and explained special status of pending and meta extensions.
Tweaks to documentation to handle extensions. Moved draft list of
extensions into schemas.html and explained special status of
pending and meta extensions.

unor/schemaorg,schemaorg/schemaorg,vholland/schemaorg,tfrancart/schemaorg,lanthaler/schemaorg,gkellogg/schemaorg,schemaorg/schemaorg,unor/schemaorg,gkellogg/schemaorg,vholland/schemaorg,twamarc/schemaorg,vholland/schemaorg,schemaorg/schemaorg,twamarc/schemaorg,tfrancart/schemaorg,unor/schemaorg,dbs/schemaorg,vholland/schemaorg,twamarc/schemaorg,gkellogg/schemaorg,tfrancart/schemaorg,lanthaler/schemaorg,dbs/schemaorg,schemaorg/schemaorg,tfrancart/schemaorg,dbs/schemaorg,schemaorg/schemaorg,gkellogg/schemaorg,lanthaler/schemaorg,dbs/schemaorg