Locked versions to allow use on freshly installed systems

Without the gemfile.lock file included in the default theme, the versions for i18n and activesupport would differ between dugway requirements and the gems installed by bundler on creation of a new theme.  This would end up requiring the server to be run under `bundle exec dugway server` on a completely fresh install.  Locking the versions to match up between the default theme and dugway's requirements fixes this issue.