Fixed dead link in FAQ to list of original total-impact contributors.

Thanks @trel for bug report.
update faq github data type to url, add pmid.  closes #25
as with issue 110 in core, allow more access-control-allow-headers for CORS support from jquery
fix error message to more accurate orcid "no DOIs found"
wordsmith: add "import" to error message so doesn't sound like an ORCID bug
third time is the charm.  remove a word so orcid import error message fits on one line.
update link to embed source code
Merge branch 'master' into flask-auth