remove italics-related styling for quotations

This is intended to go with a96f157d7997d70eee1a223c26da0463187fab1d on
the branch of the same name in Aloha-Editor
let semantic blocks scroll with content (github-bookeditor half)

This needs to go with fe7c4ad00bb29ca5e1fa84d52549cb26e43888af on
Aloha-Editor
Merge pull request #76 from oerpub/58657378-boxes-and-spacing

remove italics-related styling for quotations
Merge pull request #77 from oerpub/semantics-drag-below-fold-57739880

let semantic blocks scroll with content (github-bookeditor half)
improve header styling

Remove the borders, use better sizes, don't let letter-spacing inherit
past h1, use same margins as paragraphs.

Forthcoming (though I think relatively nondependent) commit coming on
Aloha-Editor
match the size of "Editor: [title]" to size of Book Picker and TOC
Merge pull request #79 from oerpub/improve-header-styling-58912428

improve header styling
if y'all want consistency via variables, let's go all the way
Merge pull request #80 from oerpub/match-editor-bar-title-size-58860772

match the size of "Editor: [title]" to size of Book Picker and TOC
Merge branch 'master' into 56661206