Entity selector: Option to emulate search box behavior

This change set adds a option named "emulateSearch" to the entity selector. Setting
this option to "true" links the entity selector's suggestions to the actual entity
pages. Another change set will enable entering random text in the input box.

- patch set 2: added documentation

Change-Id: If17dd8bd50af5fce096c07f3232eb5612c76167d
Merge "Entity selector: Option to emulate search box behavior"