Merge pull request #1 from adowns01/percentage_hist

Added percentage option
Merge pull request #2 from adowns01/testing

added tests for HistogramHelper
added validation class that now checks the data before anything is run
Merge pull request #3 from adowns01/validate_data

added validation class that now checks the data before anything is run
started work on testing data validations
merge conflict was over 6 empty lines
added tests for validation for isHash
added tests for values for numbers