Interval variables - adding two new exceptions#8

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rodricios wants to merge 6 commits intomasterfrom

interval-variables

Commits on Jul 22, 2015

added new error for cases when attempting to find mean of non-numerical values; the stats fns are now executed against 'elemends' and no 'values'
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upped vs. number
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Commits on Aug 11, 2015

adding errors for median fn's for when dealing with non-numeric types
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Commits on Aug 25, 2015

adding MultipleMostCommonValuesError; max, argmax and best_pair should only return when a single value is most common
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formatted test functions to match conventions regarding exception testing
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added key_types_distribution, which creates a prob. dist. of types of the elements of the referencing class; used for checking if dist is 'discrete random variable'
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