Use allow_unicode when dumping bootcamp data to YAML--this will write the file in UTF-8 rather than using escape sequences to represent non-ASCII characters in YAML
Add charset to avoid problems with UNICODE
Merge pull request #533 from r-gaia-cs/add-charset

Add charset to avoid problems with UNICODE
Merge pull request #532 from embray/master

Enable allow_unicode when dumping bootcamp cache
Fixing some generated pages:

1. `js/maps.js` wasn't escaping single quotes properly in venue names, so I stopped trying to be clever and just used escaped double quotes around things.
2. Updated the airport list to include new instructors.
3. Updated the flags in the team and previous bootcamps pages.
4. Moved some old bootcamps to the cache (while trying to debug the escaping problem).
Merge branch 'master' of github.com:swcarpentry/site
Adding Cambridge bootcamp