broadsword renaming of popover to overlay.

This avoids adblock+.
fix cnx demo popover/overlay plugin usage
use internal cursors first, fixes #467
remove too spaces at end of line
add quotation semantic element to oerpub editor
put quotation link in 'add a new...' menu
refactor quotes to use blockquote node type
refs #465: only put <P> element around orphaned media/image elements
Add placeholder for semantic block elements while dragging
make semantic block drag helper have a real title
center quotation text
show block tites as bold while editing
fix quotation placeholder text
fix selector for block titles
another bugfix to the selector for block titles
Revert "center quotation text"

This reverts commit 8a8991ba87967dd4f7ddcc437a18c4f09ae94cb1.

Conflicts:
	src/plugins/oer/quotation/css/quotation-plugin.css
fix exercise and solution type selectors
Add settings modal to semantic blocks for adding a custom class
use css for dragging helper title capitalization
refactor some quotes in the quotation plugin