Added VM memory sizes to Vagrantfile.bigcouch
Added bigcouch:children section to development inventory
Fixed apparent parse error with main.yml.dist
Broke out separate playbooks for dabase nodes and database proxy
Updated README.md
Added `vagrant box add` to README.md
Stack size tweaks for Erlang VM and CouchJS

These may be a stab in the dark, but I'm trying to work around
a problem that may be related to stack sizes.
https://issues.dp.la/issues/7486
Updated dependencies in README.md
Renamed Vagrantfile.bigcouch to Vagrantfile.ingestion
Renamed all.yml to dev-all.yml
Renamed dbproxy role to dbproxy_dev, renamed dbproxy.yml playbook to dbproxy_dev.yml
Changed role name in dbproxy_dev.yml
Renamed dev-all.yml to dev_all.yml
Changed include in dev_all.yml, updated README re. new role names
Removed group variable and put it into role
Fixed name of playbook file in README.md
Moved playbooks to new directory
Changed name of development loadbalancer role
Added web app server and renamed load balancer VMs
Added many more roles and groups, implementing most of our web services.

Changed hosts around -- see development inventory and /etc/hosts
suggestion in README.md.

Added different group variables files for development, staging, and
production.