Merge branch 'erika' of https://github.com/RonXS/protalk
Merge branch 'master' of https://github.com/RonXS/protalk
Merge branch 'master' of https://github.com/protalk/protalk

Merged upstream
Added a link to the 'how to upgrade your vagrant box'-guide in the README.
Merge pull request #188 from pascaldevink/readme-update-for-vagrant

Readme update for vagrant