Limit content width for pages

Moved dropdown menu placement to the bottom right

Bug 171:  List grid view switcher

Using just routerLinkActive doesn't work on first load, the query
parameter might not be defined. Adding 'active' to the class attribute
doesn't work either, it doesn't get removed after switching to the other
view.

For now it allows to switch between list and grid views.

Fixes https://github.com/DSpace/dspace-angular/issues/171

Meta Service