Fix attributedPlaceholder

When using an attributed placeholder the string of the floating label wasn't set. This resulted in the floating label no having any content, and therefore not visible.

Current work-around:
_textField.placeholder = @"Title";
_textField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"Title" attributes:@{}];
Merge pull request #52 from duemunk/patch-1

Fix attributedPlaceholder