US4: Set up controllers function to handle API calls upon click to resolve topic given appropriate permissions

[cathyxfeiyang]

dependencies: #45, #47, #48 Acceptance criteria:

• Visual testing that clicking on the resolve button changes resolve status to Resolved and disables resolve button
• Visual testing that clicking the resolve button changes resolve field in Developer - Source to 1
• Visual testing that resolve button is not available to anyone besides topic owner, administrator, and moderator
• Automated testing to show that a topic's resolve field is set to 1 after resolve API call with appropriate privileges
• Automated testing to show that a topic's resolve field is unchanged after resolve API call with inappropriate privileges