* is_contiguous_hashable trait identifies optimizable types
* hash_append() function overloads for basic types:
- scalars, floats
- array, C array
- pair, tuple
- boost array and tuple (if configured)
* Provided Spooky hash wrapper for use with hash_append
* Use hash_append in hardened_hash and other places
* New Utility meta functions for working with variadics:
- static_and
- static_sum
* Added type_name utility function for diagnostics
* hash_metrics suite of functions to evalulate hash functions
* Test suites to measure hash function performance
* Various fixes
