Adds an id primary key field to the user_hostgroup relationship

refs commit:28d1dd18
fixes #2419 - disable DNS orchestration during host mailer tests
Feature #2368 - renaming i18n domain to 'foreman.pot'
Feature #2368 - adding German translation file
Feature #2368 - i18n integrating Transifex
Feature #2368 - i18n extracting strings
Feature #2368 - i18n extracting strings
Feature #2368 - adding Spanish translation
Feature #2368 - i18n extracting strings
Feature #2368 - adding Rails i18n yml files
Feature #2368 - i18n extracting and locale rake task
Feature #2368 - use N_ for model validators

As per https://github.com/grosser/fast_gettext/wiki/activerecord
Feature #2368 - i18n extracting strings
Feature #2368 - merging new strings
Feature #2368 - host list popups and various fixes
Feature #2368 - form helpers, exceptions and fixes
fixes #2359 - update EPEL release number
fixes #2367 - Ruby 2.0 support

* require bundler 1.3, preventing ruby-debug19 getting installed on Ruby 2
* update 1.9 gems to install on 2.0 too
* don't use empty arrays in Hash constructor, causes ArgumentError
fixes #2410 - Set auditable type to 'Host'
Fixes #2408: don't try to reset the password in rake permissions:reset if Facter.domain is nil