Temporarily skip unit test.
Add travis configuration.
Only run widget tests if PyQt is installed.
Skip sql tests if psycopg2 is not available.
Merge pull request #79 from astaric/travis

Add travis configuration.
Changes in Mosaic GUI
Added missing packages and package data entries in setup.py
Changed few labels and PEP-restructured the code.
Merge branch 'master' of github.com:biolab/orange3
Comment to add_origin, removed previous todo mark.
- kNN classifier from scikit moved to script part (orange/classification)
- usage of default scikit learn imputer class to handle NaN; (optional) replace with Orange imputer when implemented.
- added Mahalanobis distance.
Removed long description (too verbose and obvious).
Merge branch 'master' of github.com:biolab/orange3
Moved EntropyMDL code from to widget.
Merge pull request #85 from janezd/mosaic

Changes in Mosaic GUI
Follow redirect for OSX application template download.
Updated 3rd party packages included in Orange3 OSX application template.
join_contingency for Entropy discretization: 3x-10x speedup.
Travis: install only .whl requirements.
Use explicit ordering when querying column types.