Output post thumbnail caption
Added Primary category field and implemented its use.
Fixed basic page template
Added a couple svgs
Stubbed out related articles doc section
Styled image caption
Changed name of Lead category to HP Lead
Removed sticky related functionality. Featured and Lead are what is used for promotion
Changed order of categories in pullout menu
Added related posts template functionality
Made next/previous post links use primary category
Merge pull request #43 from rexington/isimpledev_10oct

iSimple Dev Oct 10
Update pluginsettings.rst

Typo in title.
Update articles.rst

Updated category section of article.