optimize: Fix bug in LinearUnivariateExample
app.nlp.load.LoadACE: making it mostly work
app.nlp.parse: earlier GC of the training examples
optimize: temporarily switching default parallel trainer to synchronized optimizer, for big gains in speed
optimize: removing too-fine-grained locking in the ParallelOnlineTrainer for leftMultiply
app.nlp.load: cleaning up the ACE loader
Merge branch 'master' into emma-benchmarking
app.nlp.pos: removing duplication