Implemented MRProgressView#setProgress:animated: as "abstract"

Author: mrackwitz

src/Components/MRProgressView.h

@@ -31,6 +31,8 @@
  
  The animation will be always linear.
  
+ @note See this as declared abstract. This MUST be overriden in subclasses.
+ 
  @param progress The new progress value.
  @param animated Specify YES to animate the change or NO if you do not want the change to be animated.
  */

src/Components/MRProgressView.m

@@ -11,4 +11,11 @@
 
 @implementation MRProgressView
 
+- (void)setProgress:(float)progress animated:(BOOL)animated {
+    @throw [NSException exceptionWithName:NSInternalInconsistencyException
+                                   reason:[NSString stringWithFormat:@"You must override selector '%@' in %@ or a intermediate class!",
+                                           NSStringFromSelector(_cmd), NSStringFromClass(self.class)]
+                                 userInfo:nil];
+}
+
 @end