Plus/minus signs now visible when menu items are nested in navigation page. Also more centred vertically on navigation and pages lists (tested on latest chrome/firefox).
Merge branch '2.2/develop' into 2.2/nav_styles

Resolved conflict in system/cms/modules/pages/css/index.css (replaced mine with newer version)
Merge pull request #2236 from jaminday/2.2/nav_styles

Plus/minus signs now visible with nested items in navigation page