In an effort to get the blog post main content done...

Big refactoring of list and share link patterns; Small post-inset margin tweaks.
Gives more structure to the list patterns we have been creating and simplifies the share icon pattern:
- http://himedlooff.github.io/cfgov-refresh/docs/misc/#lists
- http://himedlooff.github.io/cfgov-refresh/docs/misc/#share-icon
- http://himedlooff.github.io/cfgov-refresh/docs/post/

Adds new tags pattern (used a lot from the CFPB open tech pattern):
- http://himedlooff.github.io/cfgov-refresh/docs/meta/#tags
- http://himedlooff.github.io/cfgov-refresh/blog/post.html