Also add empty implementation for dictionary
facilitator iteration APIs
Change-Id: Ia847e3faa75075c819fcfda89193d1024d2d5aca

Break contacts binary dictionary into two parts
- one that talks to contacts content provider and maintains
  local state. Includes a manager class and a content observer
- other one that just manages the dict code.

Change-Id: Ie8f89ac9ce174c803ff3168ee0bee5cbe7721d5b