Merge pull request #86 from Connexions/anatomy-bugfixes3

Bugfixes for Anatomy
base: group section level abstract rules
anatomy: remove rules moved into base
biology: remove rules moved into base leave book specific
base: section abstract
anatomy: section abstract
biology: section abstract
sociology: section abstract
physics: section abstract
Merge branch 'refactor-section-abstract' into dev

Conflicts:
	css/ccap-physics.css
	css/ccap-physics.less