Preliminary attempt to create inverse transformations and to implement ranking variants
Reimplement ranking; first draft of unittests for algorithms
Fix direct ranking (all variants working)
Fix ranking inverse functions (all tests pass)
Fix variant names; avoid modifying input_list; new tests for min_max and z_score
Raise a NotImplementedError when attempting to use an unavailable min_max or z_score variant
Add first draft of log10 transformation
First attempt to implement quadratic transformation (increasing, decreasing and both also inverse)
Fix log10 and quadratic transformations
Working with unittests for transformations (still incomplete)
Fix log10 and quadratic transformations and corresponding tests (all tests pass)
Disable 'inverse' checkbox when unavailable
Add docstrings to transformations
Add newline at the end of files
Merge master into transformations
Fix import
Merge pull request #23 from gem/transformations

Add some algorithms for data transformation and corresponding unittests