Adds inline tags (tagcloud)

Setting DISPLAY_TAGS_INLINE = True will cause the theme to render all tags
inline in the sidebar.
Merge branch 'tagcloud-inline' of https://github.com/magnunleno/boothack into magnunleno-tagcloud-inline

* 'tagcloud-inline' of https://github.com/magnunleno/boothack:
  Adds inline tags (tagcloud)
Clarify use of inline tags