removed unnecessary method + doc within Settings Framework
Added settings-framework documentation
minified settings-framework wrapper-length
added err check
fixed #1477
gravatars will be generated on demand

changing the setting in ACP will affect all default gravatars now.
cleanup toggleFollow
Merge pull request #1484 from frissdiegurke/master

Settings Framework docs + slight changes
collapsible blockquotes, closes  #1359
removed deprecated categories.background property
fixes routes for https://github.com/designcreateplay/NodeBB/issues/1485
closes https://github.com/designcreateplay/NodeBB/issues/1474
closes https://github.com/designcreateplay/NodeBB/issues/1473