Sort and remove duplicates from assignee options and save to cache
Simplify assignee selector and remove html from agentOptions
Change _.reduce argument to be generic
Reinstated populateAssignees method
Refactor _getHtmlOptions into _populateSelectBox
Merge pull request #22 from zendesk/daniel/fix_for_unsorted_assignee_list

Sort and remove duplicates from assignee options and save to cache