Ensure titles show up in Views, etc.

Problem/Motivation

The title isn't a real field, so it doesn't go through the field functions that place microdata. Currently, in hook_node_view we place the title. This doesn't work for other entity types and also doesn't work in Views.

Proposed resolution

Move the functionality to the hook_process_page stage and compute the title microdata for each entity that's been placed in the microdata items array.