Jotting down some notes for feature ideas
Tests passing for the hash table
WIP: LRU
Major refactoring

I've gone through and refactored the hash table implementation and split
it into two parts: the core implementation and an Erlang adapter. This
will allow me to build up other data structures using a hash table more
easily.
WIP: Adding list type
Reorganizing c_src

Moving things around and switching to a NIF per data type.
More layout tweaking
Move to using a single C source per NIF
Remove dep on PropEr
Hash nif builds again
Tests passing for johnny_hash