0.0.9

Fix fast_knn incorrect weighting bug. Replaced distance weighting with inverse distance weighting and ability to swap in custom function (arg: 1D list of distances, ret: 1D list of weight percentages). New namespace created impyute.util.inverse_distance_weighting for functions that can be modified with custom args using functool.partial (check test for more details).
pybase dockerfile bug fixes
New contrib folder created and some of the utilities from util moved there:
- impyute.util.compare -> impyute.contrib.compare`
- impyute.util.count_missing -> impyute.contrib.count_missing
- impyute.util.describe -> impyute.contrib.describe
Util namespace breaking changes
- impyute.util.find_null->impyute.ops.matrix.nan_indices
- impyute.util.preprocess->impyute.ops.wrapper.wrappers
- impyute.util.checks->impyute.ops.wrapper.checks
- impyute.util.BadInputError -> impyute.ops.errors.BadInputError
- impyute.util.BadOutputError -> impyute.ops.errors.BadOutputError

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