Merge pull request #1 from gabytasol/master

prints a multiplication and substaction was implemented instead of printing a sum

using the real files that contains the tweets2009-06 and numeric2screen information

putting together screenName and userID

getting the sscreen names from the Twitter Data set

frequency of stop words obtained from the Twitter data set are written in the outputFrequencyStopWords.txt file

a sum was added

two variables were initialize

a readme file was added