Economics general bugfixes

This branch contains general fixes for a variety of issues in the upcoming Economics Text.  There will be three total Pull Requests for economics bug fixes.  This one, and then an "answer key" pull request that is a general round of bug fixing for the Economics Answer Key.  The final one is the pending one that exists already that takes care of the non-bolded index term for the glossary.

1. Removal of equation numbering when MathML is used in text.
2. Fixes for References (indentation, justification fixes for URLS, 
3. Fixes for Key Concepts Headers and Subheaders.
4. Features changes for header spaces, font/spacing changes for bulleted lists internal to features
5. font size/styling fixes for Figure/Table Id's and titles.

Chapter Objectives rollback code (the utilization of default module aggregator box for Chapter Outline as well as Learning objectives) has been added and commented out.  If the decision is made to do this work we have access to it.