Make sure we got the public key. Removed proxy

When running apt-get update I was getting errors like "W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/Release.gpg  Could not resolve 'false'". This because the entry in ```/etc/apt/apt.conf.d/proxy```

>> Acquire::http::Proxy "http://false:";
Make sure we can install boost1.49 packages
Fetch the latest version of HHVM
We do also need main
Changed according to the HHVM docs
Merge pull request #1 from Nyholm/master

Fixed errors on the installation. Tested using Vagrant 1.5.4