Enable ARC (CLANG_ENABLE_OBJC_ARC=YES)
Fix EditViewController bug

Forgot "return self;"
Remove EditViewController#initWithNibName
Refactor
Implement edit callbacks (Use UITextViewDelegate)

- (void)textViewDidBeginEditing:(UITextView *)textView
- (void)textViewDidEndEditing:(UITextView *)textView
To editable immediately on the screen transition