Version 0.9.12

• Fixed serious issue where merging feature sets was not working correctly.
  All experiments conducted using feature set merging (i.e., where you
  specified a list of feature files and had them merged into one set for
  training/testing) should be considered invalid. In general, your
  results should previously have been poor and now should be much better.
• Added more verbose regression output including descriptive statistics
  and Pearson correlation.