Update sites.json

cloudapp
Add Parse's Documentation Overview to sites.
Update sites.json

foursquare
Update sites.json
Merge branch 'patch-4' of git://github.com/MikeBeas/DevCenter.me

Conflicts:
	sites.json
Merge branch 'master' of git://github.com/hramos/DevCenter.me

Conflicts:
	sites.json
Merge branch 'patch-3' of git://github.com/MikeBeas/DevCenter.me

Conflicts:
	sites.json
Merge branch 'master' of github.com:stevestreza/DevCenter.me