small updates to node-schema-org

Hey there, this utility turned out to be quite useful for something I'm working on, but it needed a couple tweaks to work for me so I thought I'd share them back with you.  First commit has the functional changes:  a couple command line enhancements to the read-schema-org script to control concurrency (75 ground my laptop to a halt) and limit the parsing to specific schemas (useful for testing); also made some small enhancements to the parsing in read.js, primarily adding the version info from the source HTML.  The second commit is just the latest schema files run with this version of the parser.  --Ken