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.