Mostly a straightforward porting of style code to CSS, except
that various bits of other code referenced a few GenericDisplay
constants, so those needed to be ported as well.
Add some padding at the top between the close button and the items.
Center the text and description.
https://bugzilla.gnome.org/show_bug.cgi?id=600734
Places is one of the dash sections and it should be included in search results.
Factor out the code for getting and updating the information about places from
Places to PlacesManager.
Introduce PlaceInfo class that contains information about the place and can be
used by classes that display it in different ways. Rename classes so that their
names are consistent with corresponding classes in appDisplay.js and
docDisplay.js
https://bugzilla.gnome.org/show_bug.cgi?id=599125
