* Zero lets classes efficiently compare with 0, so
you can use constructors like x < zero or y != zero.
* New BEAST_CONSTEXPR to handle Windows/C++11 differences
regarding the constexpr specifier.
* 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
* Header-only!
* No external dependencies or other beast modules
* Compilation options allow for:
- Stand-alone application to run a single test suite
- Stand-alone application to run a set of test suites
- Global suite of tests inline with the host application
- Disable test suite generation completely
* Existing tests reworked to use the new classes
* Cannot set noRipple flag with negative balance.
* Paths with consecutive no ripple links are invalid
* Adjust pathfinding value of no ripple out paths
* Check for no ripple when adding links in pathfinding
* Remove old noRipple logic
* Update trust line delete logic
