Draft of OTC medicine blog post

- Add draft of post about OTCs which can cause AEs that affect driving
- Change post author logic to use author `name` as key instead of
author email
- Add support for author `fullname` (including credentials)
- Add logic for explicit post summary in place of `post.excerpt`
(necessary because posts with footnotes do not render properly in
`post.excerpt`
- Add bootstrap table class to all tables
Add author picture for Roy Xu
Merge pull request #76 from FDA/baker.add-blog-post

Add blog post