Add youtube channels and blog link to "What's on" section.
Add TableViewSectionAgent WhatsOnAgent to deal with each sections.
Add SectionAgentFactory to create and manage SectionAgents."

Change TableViewAgent to SectionAgent.
Add 'BasicInformationAgent' to deal with information section.
Pass tableViewController itself to sectionAgent.

* Link to MapViewController by storyboard ID.
* Add constrains to MapViewController to make sure the tool bar and map view will be the right place.
Link to AcademicViewController by storyboard ID.
Link to ActivityViewController by storyboard ID.
Use QuickLook to preview session Class schedule PDF.
Add 'Contact Us' view controller.
Merge branch 'feature/static-to-dynamic' into develop
Add 'UsefulLinkAgent' to deal with 'Useful Link' section.
Fetch category objects from Parse.
Fetch useful link item objects from Parse.
Dispose some resource that can be recreated when receiving memory warning.
Merge branch 'feature/useful-link' into develop
Add storyboard id to private information viewController to resolve warning.