Changed contingency computation and its output for continuous features.
Adapted EntropyMDL to use the new contingencies.
Re-added interface to check contingencies for single class values.
Adapted SQL contingencies.
Fixed a ValueError in Orange/widgets/utils/scaling.py

Due to the seed for numpy.random being to large.
Updated data.storage documentation.
Disable the OSX font fix if using Qt 4.8.6 or later.

Qt 4.8.6 already contains a fix for this.
Explicitly remove items from layout before repositioning them.

Fixes a warning from Qt.
Merge pull request #103 from ales-erjavec/heatmap

Heatmap
Move optional requirements to separate files.
Merge pull request #100 from markotoplak/contingency

Different computation of contingencies
Use itertools.product instead of custom code.
Improve warnings.
Fix bug when Data subset is given.
Code pruning and improvements.
Remove warning after receiving proper data.
Improve sql code.
Merge pull request #104 from astaric/requirements

Move optional requirements to separate files.
Merge pull request #105 from lanzagar/mosaic

Refactor Mosaic Display
Added missing priority tags.