Made the signup and volunteer dialogs i18n configurable.

The checkbox for TOS and the text on the volunteer dialog are
now configrable via the i18n interface.

Implemented for 18F/midas-open-opportunities#1
Switching translation variables to modified camelCase.
Merging in the home page changes
Removed 'AObject' translation entries in favor of 'ObjectIndefinite' entries.
Merge pull request #352 from DavidEBest/devel-i18nTOS

signup and volunteer dialog text should be configurable.
chef support for config overlay

sync a config repo
run make import
with specific role for Open Opportunities config
customized deploy now works on vagrant

include debug logging with Vagrant build
since we’re usually using it for debugging
or for new devs
older version of chef didn't match names correctly