BF: Use filtfilt() from future if scipy's is broken (fixes gh-157)

prior SciPy 0.11
Merge branch 'master' of github.com:PyMVPA/PyMVPA

* 'master' of github.com:PyMVPA/PyMVPA:
  BF: if no combiner -- place training_stats into a dict
  RF: place labels for pair-wise results into a single fa matching original attribute (e.g. "targets") in tuples
  RF: squeeze out the degenerate dimensions for pos/neg labels in pair-wise classifiers
  RF: no "combiner" -- no "estimates" in CombinedClassifier (and no warning)
  RF: Removing what was apparently copied/fixed in sandbox/multiclass.py
  ENH: allow MulticlassClassifier to operate without combiner thus just spitting out all pair-wise predictions (without any voting)