experimenting with page breaking rules to stop floating example bumper
work for example fixes and header breaking
fixes for calculator feature header to appear in solutions and problems for examples
fixes for page breaking across example heads, features and general fixes for numerous layout based items
fix for solutions figure numbering needed in numbering.less for statistics file, all css files rebuilt
fixes for css properties on one line, minor cleanup of extra classes, removal of testing ancestors
refactored .x-feature function and associated features to drop @color background property that is unused
small refactoring of free-response section and general line broom up
refactored bringing it together collation sections using a mix-in
added comment to refactor glossary section in precalculus once book begins
Merge pull request #130 from Connexions/statistics-bugfixes

Statistics Fixes for Numbering, Example headers breaking and miscellaneous fixes