Tweak logging in Tool
Add logging to Timed trait
Revert to Hadoop 1.0.3
Add KryoSerialization trait
Working on Kryo serialization
More work needs to be done on Kryo serialization
Disable Kryo serialization
Change Seq to Array in graph representation.

The Seq representation of Neighbourhoods and Balls has been changed to
an Array representation. This leads to gains in space at runtime of up
to 70%.
Fix tests