if affixed top add scrollTop to it position.top
calculate and cache pinnedoffset independent of scrolling for initial load

fixes #10205 Scrollspy Doesn't Support Chinese ID Targets  http://mathiasbynens.be/notes/html5-id-class

* Deprecate .pull-right class for .blockquote-reverse
* Move font-size change to the parent, blockquote, instead of setting on the p element to allow more flexible content

This divides banner from code.