JDK 8 code review request for initial unsigned integer

[Roger Riggs]

A comment or two on the webrev for unsigned:

      http://cr.openjdk.java.net/~darcy/4504839.2

1. In the new parsing methods, could the String arguments be changed to 
the more general
java.lang.CharSequence? For many parsing applications, it could be more 
convenient
to pass a CharSequence than to create a new String.

For consistency, should all of the parse methods be converted from 
String to CharSequence?

2. To be consistent, the new thrown exception messages should not end 
with a period (".")

Roger