Update Vagrantfile to use docker apt repository
Don't force a non-existent npm version, use latest from epel

Not the smartest thing to do
Merge pull request #1671 from kim0/patch-3

Don't force a non-existent npm version, use latest from epel
Merge pull request #1656 from KSid/vagrantfile-0.6

Update Vagrantfile to use docker apt repository