parameterized boost a bit, still kind of broken
now filters Moses phrase tables too
Added phrase-based decoding support to the pipeline

You can now add "--type phrase" to trigger phrase-based training (via callouts to
Moses) and decoding (with Joshua's phrase-based decoder)
The OOV penalty is now -100 inside the decoder instead of 1

This means that the decoder itself always strongly disprefers OOVs; tuning
can still downweight it, but this is more natural than relying on a hugely negative
weight for OOVs