Style post metadata

* footer contains post metadata
* time and address are used, but inline
Add and style post tags

* :before is used to style list as comma separated tags
Normal font weight for Quicksand

Using the default bolder font-weight for Quicksand headers renders the
text double on iOS. Adding the 700 webfont would make the font too bold
+ decrease page speed.
Slightly darken body color
Use h1 titles on tags, categories, etc. pages