Fixed transposed pairwise feature size in README, and noted that feature dimensionality is not necessarily equal to number of labels.
Fixed transposed pairwise feature size in README, and noted that feature dimensionality is not necessarily equal to number of labels.

crowd-ai/post-processing-experiments,lucasb-eyer/pydensecrf,crowd-ai/post-processing-experiments,crowd-ai/post-processing-experiments,lucasb-eyer/pydensecrf,lucasb-eyer/pydensecrf,crowd-ai/post-processing-experiments