UINavigationController subclass that includes methods to show/hide an upload progress bar from the navigation bar.

##Usage:

###Installation: Cocoapods: pod 'JMUploadProgressNavigationController' coming soon

###API

• Indicates whether or not the progress view is displayed
  @property (readonly, nonatomic, getter = isShowingUploadProgressView) BOOL showingUploadProgressView;

• Called when the upload is started, shows the progress view
  - (void)uploadStarted;

• Used to update the progress view
  @param progress A number between 0 and 100 representing the progress completed
  - (void)setUploadProgress:(float)progress;

• Called when an upload is cancelled
  - (void)uploadCancelled;

• Called when an upload is resumed
  - (void)uploadResumed;

• Called when an upload is paused
  - (void)uploadPaused;

• Called when an upload fails
  - (void)uploadFailed;