updates layouts to replace drop-target-aside with drop-target-aside-before-main and drop-target-aside-after-main
removes unnecessary drop-target-aside's
Merge remote-tracking branch 'origin/master' into split-sidebar-target-65918658
adds back the removed main drop targets
remove unused layouts and fix layout markup
fix class name typo
fix broken specs
Merge pull request #20 from G5/split-sidebar-target-65918658

Entire Sidebar is attached to CTA's