Using bundle to handle needed gems.
Use a Rakefile instead of a shell script.
Removing duplicate entry.

The duplicate didn't show up in the page because the position was set as
"alumniphd", not "alumni-phd".
Cleanups to person and project-related code.

Also added a "status" field for projects, and moved all the past projects
into projects.json.
Fixups to the README, given my other commits.