Traits in package have an initial method with an illegal method name

``` scala
package foo {
  trait Bar
}
```

``` scala
% javap -c foo/Bar
Compiled from "tp.scala"
public interface foo.Bar {
  public foo.Bar initial$foo.Bar();
    Code:
       0: aload_0
       1: areturn
```

Note that the method contains a '.' which is not allowed:

``` scala
java.lang.ClassFormatError: Illegal method name "initial$foo.Bar" in class foo/Bar
```
