Statistics bugfix2

Fix for General Note feature to correctly style note title with amended cnxml structure.  Currently note title tags are not being directly used underneath note tag, but a para tag is being added directly beneath note tag and title is being placed on first paragraph.  Works, but semantically incorrect.  LESS file amended to style with properly marked up General Note.

Due to this fix, and using :not pseudo selector for General notes other than features, chapter-objectives note must have a couple of properties overridden (text transform, & text-center) to style correctly.