Summary functions enhanced#32

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Darshna-Shah wants to merge 3 commits intomasterfrom

SummaryFunctionsEnhanced

Commits on Aug 11, 2017

updated Summary functions so now works for a a vector or dataframe input of numerical and factor data types
Darshna-Shah
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Merge branch 'master' into SummaryFunctionsEnhanced
Darshna-Shah
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optimised VSummary function to use switch rather than if statements
Darshna-Shah
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