Switch to murmurhash3 (which is somewhat better than superfasthash in my tests).
Merged 'has_val' and 'flag', customizable alphabet size.
Pass hattrie_t* to alloc function to allow custom allocators.
Simplified trie node consuming code.
Fixed ahtable_del() corrupting slot for certain string lengths.
Simplified node finding code and cleanup of repeated code.
Added simple node deletion.

To do - merge of free buckets.
Implemented string deletion to str_map.
Implemented tests for trie/ahtable node deletion.
Fixed typo in hattrie_find.
Merge branch 'master' of https://github.com/vavrusa/hat-trie
Fix a warning in check_ahtable.
complete the merge from mainline

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>