Version 4.0 - Updated UI, New Delegates, Better Performance

Version 4.0
    - Code reorganized, cleaned-up, and condensed. DropboxBrowser is
now one easy-to-use class (previously three classes with complex
delegate calls)
    - New icon, graphics, and help menu for example project
    - Added Icons for over 100 types of files and folders supported by
Dropbox - proper icon is shown next to each file
    - Added four new delegate methods and depreciated older methods
    - New TableView animations - changes in directories are now
animated
    - New Navigation Bar - new design, also shows title of current
folder
    - Simplified Navigation Controller customization. Please refer to
the new setup and integration procedures
    - Updated Refresh Control - now the refresh control actually
fetches updates from Dropbox and displays them
    - Removed Loading HUD for iOS 6+ users - the refresh control now
appears instead of the black overlay. If you support versions lower
than iOS 6, the HUD will be used.
    - Fixed Done Button Bug where it may randomly disappear or reappear
    - Fixed Back Button issue where the user could back up past the
Root Directory
    - Fixed TableView Subtitle information. Formatting now mimics the
Dropbox App
    - Fixed Download Progress View issue where the download progress
would not reset after each download
    - Major Performance Improvements
    - Added open-source license (MIT license). License from Daniel
Bierwirth