fixes #2405 - disable DNS orchestration during TFTP tests, causing timeouts
refs #2254 - STI Host relationships
fixes #2263 search Hostgroup by label
fixes #2247 Provides an option to disable the use of gravatara

A new setting is added, use_gravatar. It defaults to true. If it is set to false, then the gravatar
call out is not used and only the default user icon is used.
fixes #2360 loading parameters on host edit form when hostgroup or environment is changed
fixes #2417 - SSO abstractioning

Apache and Signo SSO reworked to a new general SSO concept.

You can use SSO service that comes with Katello for loggin in. It's
based on OpenID protocol with slightly customized provider.
fixes #2263 continuation - turn off auditing for migration of adding Hostgroup label
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