Lots of changes for the April 1, 2014 edition:
Added Vinnie Falco as co-author.  He has contributed much, including much better names than I had, the universal aspect of 'uhash', and invaluable testing.
Introduced the type trait: is_contiguously_hashable.  This is a huge optimization.
Changed the type of X to have more realistic values (restricted to realistic ranges instead of being completely random).  This stresses the hash functions more in the quality department.
First pass with a grammar hammer.
Work in Progress:  Added many references and details.  Still need to update Acknowledgments and add rationale for design decisions such as using operator() instead of append in the Hasher.  Also need to add example user-written uhash alternatives that for example have random seeds.
Finished implementing outstanding suggestions (as far as I know).
Add further polishing prompted by various good suggestions.
Just minor wordsmithing.
Clarify relationship to N3333.
Beefed up introduction.  Added appendix.  Refined grammer.  Several more misc. fixes.
Massive update.
Misc fixes.