sdopending while pending.
Scrubbed mention of 'asset' property (which never really existed) from distance property. Reworded slightly.
See also http://lists.w3.org/Archives/Public/public-vocabs/2014Jun/0126.html
Added Microdata and RDFa examples for every Role example.
Merge pull request #39 from danbri/master

More changes for 1.6, removed mentions of non-property 'asset', added Microdata/RDFa for Role examples.