Hotfix/default hash with seed (#19)

* add seed to default hash and simplify hashing

* update CHANGELOG

* version bump

version bump; update changelog and readme

add cms_merge_into functionality (#13)

* quick cut at merge into functionality
* unify validate and merge code
* fix make file

v0.1.6; remove python implementation

minor updates

0.1.4 (#8)

* Python implementation
* Overflow checks
* Standard int sizes for import/export

fix merge issue

0.1.2 (#2)

* add, remove, lookup elements based solely on the hashes
* changed int array layout for future import / export
* fix min->max misnomer

docs

updated README