Update node widths with Firrtl Transform

Working transform that will adjust widths of
registers, ports and wires through the annotation system.
Second piece of the augmented tool chain that will ultimately
take advantage of firrt interpreters instrumentation output.
Adjusting widths according to data gathered thereby.
Part of Issue #114

src/main/scala/dsptools/numbers/resizer/ChangeWidthTransform.scala

@@ -68,11 +68,6 @@ class ChangeWidthTransform extends Transform with LazyLogging {
         changeRequests.contains(name)
       }
 
-      def annotationToWidth(annotation: Annotation): Width = {
-        //TODO (chick) complete this
-        IntWidth(32)
-      }
-
       def changeWidthsInExpression(expression: Expression): Expression = {
         expression
       }