new script, calcGraphValues

added some new test Field Test files

FieldTest_File:
- using os.path to format the given filePath string so that it doesn’t
break open(filePath)
- Adding a short case into loadFieldTestInfo that checks if the
NetworkProvider parsed form the file is spelled ‘sprint’ without the
capital ’S’

calcGraphValues:
Takes two options (file type and folder path to raw data), and creates
a CSV of the values necessary for creating a graph of the average
throughput for each carrier, and the standard deviation of that average.