Imputing missing values when computing distances
Data imputation on distances is performed only when needed by Distances widget
Sort by predicted values in Predictions widget
Fixed tree tests using multinomial attributes with scikit-learn methods.
Merge pull request #180 from thocevar/tree

Fixed tree tests using multinomial attributes with scikit-learn methods.
Leave the original data intact when imputing values for distance computation.
TestLearners AUC metric.
Merge pull request #177 from marinkaz/distances

Imputing missing values when computing distances.
Restore original order in Predictions widget.
Clean imports.
Hides sort indicator for unsorted ordering in Predictions widget.
Improve code clarity.
Merge pull request #179 from thocevar/predictions

Sort by predicted values in Predictions widget
Binary measures.
Merge pull request #182 from acopar/test-learners-auc

Test learners auc
Documentation and examples for majority and mean predictors.
Linear regression example.