Add sub-project metadata to JSON files

Use JSON files to store metadata about sub-projects (like clients) as
well as just core team members.
Add oslo-core
Merge pull request #3 from markmc/oslo-core

Conflicts:
	stats.py
Fix 'project' option handling.

A previous commit changed this option so that you provide a json file,
not a project name.  That makes sense ... but it didn't work.  Now it
does.