append definition related commentary links to the definition text
remove the landing page sidebar when loading a reg section
move 'landing' class to section tag so that it is removed when a reg section is loaded
add skip to content link for screen readers
fix IE8 history drawer header height issue
Merge pull request #331 from ascott1/master

Remove landing page sidbear when loading a reg section & append definiton commentary within the definition text
PEP 8
Merge upstream