[gwt-contrib] DiskCacheToken wrapper type for easier serialization. (issue1391802)

[scottb]

Reviewers: zundel,



Please review this at http://gwt-code-reviews.appspot.com/1391802/

Affected files:
  M dev/core/src/com/google/gwt/dev/util/DiskCache.java
  A dev/core/src/com/google/gwt/dev/util/DiskCacheToken.java
  A dev/core/test/com/google/gwt/dev/util/DiskCacheTokenTest.java


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