Drop the ceil calls.

The `ceil` calls were added back when updating things for iOS 7, to model what
the older `-sizeWithFont:` call did. But looking back, Apple likely moved off
the api (and behavior) with the adoption of retina screens, so we should do the
fade calc based on the fractional sizes also, so we don't force a fade when the
string fully fits.

iPhone/GTMFadeTruncatingLabel.m

@@ -53,9 +53,6 @@ - (void)drawTextInRect:(CGRect)requestedRect {
   CGSize size = CGSizeZero;
   if (self.font) {
     size = [self.text sizeWithAttributes:@{NSFontAttributeName:self.font}];
-    // sizeWithAttributes: may return fractional values, so ceil the width and
-    // height to preserve the behavior of sizeWithFont:.
-    size = CGSizeMake(ceil(size.width), ceil(size.height));
   }
   if (size.width > requestedRect.size.width) {
     UIImage* image = [[self class]