Add a provider line

It is hard to tell what box goes to what provider, so why not add a
line for people to fill out and detail a provider
Update vagrant-lxc base boxes
Merge branch 'master' of https://github.com/gwagner/vagrantboxes-heroku
Clean up gitignore
Add missing html
Merge branch 'update-vagrant-lxc-boxes' of https://github.com/fgrehm/vagrantboxes-heroku

Conflicts:
	www/index.html