Version 5.0

Huge changes! iOS 7 Redesign, new features, enhancements, bug fixes, and better documentation.

**Breaking Changes**
* Deprecated some delegate methods. They have been marked as deprecated and will become unavailable in a future release.
* Previously deprecated delegate methods are now unavailable.
* Some properties and methods that were available publicly (but should not have been) and were unsupported and undocumented have been moved to a different scope of DropboxBrowser. For all supported methods and properties, please refer to the `Readme.md` and all other documentation (including the header file).

**Other Changes**
* Redesigned DropboxBrowser for iOS 7
    * New Sample App
    * DropboxBrowser takes advantage of the new `tintColor` API
    * New controls, look, and feel to match the new Official Dropbox App
* Revamped subdirectory system. Resolves #9 
    * Instead of reloading the same table with a different directory and funky navigation buttons, a new view controller is pushed onto the navigation stack.
    * Simplified navigation code by a bajillion times resulting in easier, more fluid, more beautiful navigation
* New search features and bug fixes.
    * Search placeholder now updates with folder name.
    * Search bar hidden above table view until the user pulls it down.
    * A *No Search Results* message is displayed if there are no results.
    * Added property to toggle search bar display
    * Fixed bug where clearing search text, but not canceling the search, would cause random search results to appear
* Enhanced File Conflict Handling now handles conflicts where the modification date is the same
* New File Download Notifications
    * DropboxBrowser can now deliver a notification when a file download completes or fails
    * Use a new property to set whether or not notifications should be delivered
    * New delegate method to fetch the notification object after it is delivered
* Built for 64-bit devices, `arm64` compatible and ready.
* Cleaned up code
    * Removed obsolete methods
    * Restructured in-efficient methods
    * Made some methods and properties *private*
* Fixed bugs
    * Fixed download progress bar bug
    * Fixed reload table view bug
* Preparing to add Logout feature - added but commented out for now

**Known Issues**
No known issues

**Fixed Issues**
Fixed issue where UITableView was reloaded each time the user drilled into a subdirectory, rather than pushing a new UITableView onto the navigation stack. DropboxBrowser now pushes a new UIViewController onto the navigation stack.