Gives fieldsets a background color (nested fieldsets an opacity)
Adds missing scss files
Gives fieldsets a right margin so they don't flow offscreen
Merge pull request #875 from sonatype/7710_nested

Gives fieldsets a background color

+ Nested fieldsets have an opacity, so they appear darker than their parent.
+ Margins, padding, and borders have been changed as well.
Allow specifying of bundle to be used by modern ITs via system property
Merge remote-tracking branch 'origin/master' into NEXUS-7292-scheduler-rework