[WIP] Beef up Vagrant support
Tweak Vagrantfile
Tweak Vagrantfile

* fix typos
* reduce VMWare Fusion memory allotment
* update Chef attributes based on worker.*.yml
Merge branch 'master' into ha-feature-vagrant
Merge branch 'master' into ha-feature-vagrant
Remove standard recipes for travis-images-driven Vagrant boxes

These should be run when the box is provisioned.
Document dynamically defined VMs for local use

The user will need to install Packer and build Vagrant boxes they want, since we are not distributing them anywhere.
Tweak README
Merge branch 'master' into ha-feature-vagrant
Merge branch 'master' into ha-feature-vagrant
Adapt to the new template files directory layout
Ignore Vagrant-related files
Pass cookbooks SHA to system_info recipe
Merge branch 'master' into ha-feature-vagrant
Skip checking for templates directory

It's in this repository now.
User 'vagrant' need not be defined
Remove manual configuration via roles entirely

It is loaded for all VMs, which is undesirable.
Merge branch 'master' into ha-feature-vagrant
Add disclaimer in README
Merge pull request #427 from travis-ci/ha-feature-vagrant

Beef up Vagrantfile