Fixes camel case field refs sometimes not matching dashed counterparts.

E.g., this should work:

 <ui:style type='com.google.gwt.sample.mail.client.Contacts.Style'>
 .contacts-break {
   padding: 0.5em;
 }
 </ui:style>

 <g:FlowPanel styleName='{style.contactsBreak}' ui:field='panel'/>
</ui:UiBinder>

Reviewed by klpatfoot

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@7078 8db76d5a-ed1c-0410-87a9-c151d255dfc7