Add install args
Merge pull request #20 from nlisgo/salt-provisioning

Add install args
updated readme with a caveat to the vagrant version
Merge branch 'salt-provisioning' of https://github.com/elifesciences/elife-vagrant into salt-provisioning
Updates for AWS compat
Merge pull request #19 from IanMulvany/salt-provisioning

updated name of settings file
Merge pull request #21 from elifesciences/feature/salt-update

Updates for AWS compat
updated vagrant version needed in prequisites:wq