Merge pull request #42 from erinspace/master

Changed schema info to make ORCID optional
Update README.md
Update README.md
Merge pull request #48 from erinspace/master

Update the readme to include PubMedCentral scraper
Merge branch 'master' of https://github.com/CenterForOpenScience/SHARE

Conflicts:
	README.md
Update README.md
Moved mention of wiki to top.
added columbia academic commons to the readme
Merge branch 'master' of https://github.com/CenterForOpenScience/SHARE
added CrossRef to the readme