updating arrybyte to seqbyte

- Changed all bases to be saved as Seq[Byte] instead of Array[Byte] to allow for easy element comparison
- Changed BayesianCaller and LogOdds caller to save alleles and sequences as Seq[Byte] to save conversion costs back and forth to strings

This is another piece pulled out of #147
Yes intentional, actually these are removed due to #163 since we only have het variants there