Initial implementation of Kyotocabinet backed Log

[josephglanville]

This implements a persistent log using the embedded database Kyotocabinet.

[aflatter]

What's the state of this again?

[josephglanville]

It's mostly working (the bugs aren't in the log implementation) there are some issues when using any sort of persistent log implementation though.

I haven't had time to really loop back on and clean this up though, it is however functional.
I will probably be actually using this code in the nearish future though so I will be coming back and making sure we get the persistent log working nicely.