updated liblinear to 1.94
updated README
Renamed joint-alignment to alignment (and deprecated non-joint variant of alignment)
Bugfix for MPI version of NN leaner: do not update by gradients from others while computing gradients in mini-batch
Weighing the candidates. TODO: implement max-violation
Bugfix for zero gradient
better penntreebank parsing by automatically removing non-trees
Bugfix for potential memory collaption when removing cycles