Merge pull request #97 from robszumski/master

fix(systemd): add execstop command and remove restart references
fix(ec2): output ami id correctly
Update Vagrant download location

http://downloads.vagrantup.com/ is now a place for *old* versions of vagrant. http://www.vagrantup.com/downloads.html has the new hotness.
Merge pull request #99 from mikemaccana/patch-1

Update Vagrant download location
bug(repo): fix repo url
Vagrant doc updates

 - The VMware vagrant provider requires an additional purchase.
 - The error described no longer applies to the current 1.4 version of Vagrant
Merge pull request #100 from mikemaccana/patch-2

Vagrant doc updates
fix(launching): make docker usernames more clear