Fix finder_needs_type check in sti mixin
intruducing color variable and mixin in the scss files
Fix tests misusing assert and assignment vs. comparison
add SLES and SLED to Suse family
fixes #2452 - allow nil form, used for checkboxes in taxonomies wizard
fixes #2455 hostgroup not saving
fixes #2393 - Couple of models broken with audited 3.0.0

this is not a fix for the mass assignment problem, rather just to solve immedient packaing issue upstream.

a follow up on mass assignment should be done via another commit.
Fixes #2454 - Fix loading settings in production

The Setting subclasses are not preloaded in initialization phase in
production.

Also (if Setting.first rescue (false)) is not satisfied when the
settings are not set yet. Using table_exists? instead.

Also, define constants before audited So that the constants are available even
when not migrated yet.