Addressed some build warnings

Author: michaeltyson

TPKeyboardAvoiding/UIScrollView+TPKeyboardAvoidingAdditions.m

@@ -264,8 +264,10 @@ -(CGFloat)TPKeyboardAvoiding_idealOffsetForView:(UIView *)view withViewingAreaHe
 }
 
 - (void)TPKeyboardAvoiding_initializeView:(UIView*)view {
-    if ( [view isKindOfClass:[UITextField class]] && ((UITextField*)view).returnKeyType == UIReturnKeyDefault && (![(id)view delegate] || [(id)view delegate] == self) ) {
-        [(id)view setDelegate:self];
+    if ( [view isKindOfClass:[UITextField class]]
+            && ((UITextField*)view).returnKeyType == UIReturnKeyDefault
+            && (![(UITextField*)view delegate] || [(UITextField*)view delegate] == (id<UITextFieldDelegate>)self) ) {
+        [(UITextField*)view setDelegate:(id<UITextFieldDelegate>)self];
         UIView *otherView = nil;
         CGFloat minY = CGFLOAT_MAX;
         [self TPKeyboardAvoiding_findTextFieldAfterTextField:view beneathView:self minY:&minY foundView:&otherView];