Bucket

Vectorized contiguity builder - should be easier to parallelize:

In [17]: run contiguity_decomp_bf.py
[0, 1, 2, 3]
Sequential:  237.146250963
importing combinations from itertools on engine(s)
Parallel:  68.2657179832
importing numpy on engine(s)
Parallel vectorized:  2.08636283875
Serial vectorized:  3.79399108887