Merge pull request slackhq#184 from slackhq/send-button-fix

Fixes Send button not being disabled/hidden. Fixes slackhq#183

Author: farhadn

Examples/Messenger/Tests/ReferenceImages/SLKTextInputbarTestsSpec/display_a_default_input_bar_iphone5_portrait_ios8@2x.png

@@ -20,7 +20,8 @@ @implementation SLKTextView (SLKAdditions)
 
 - (void)slk_clearText:(BOOL)clearUndo
 {
-    [super setText:nil];
+    // Important to call self implementation, as SLKTextView overrides setText: to add additional features.
+    [self setText:nil];
 
     if (self.undoManagerEnabled && clearUndo) {
         [self.undoManager removeAllActions];