add first cut of faster forward-backward. still buggy with wrong logz's
BP: making BPSummary git reasonable answers for zero variables
BP: removing printlns
Merge remote-tracking branch 'luke/faster-bp-chain' into luke-fast-bp
BP: making Luke's fast chain BP work; fixing many bugs in expnormalization all over
Merge pull request #53 from alextp/luke-fast-bp

Luke fast bp
BP: fix typo
fix test failures
app.nlp.ner.NER3: actually setting to the maximizer at test time
BP-ish: actually calling .setToMaximize when using BP.inferChainMax, as it's no longer the default behavior
la: adding code to initialize dense tensors randomly
Merge remote-tracking branch 'upstream/master'