First commit
feat(get_data) create a function to get a data frame from the XLSX file

The function use the xlsx library wich depend on rJava. The JVM throws an OutOfMemoryError.
The JVM parameters should be modified to increase the xMx value.
feat(functions) add get, clean and load functions

The cleaning function is not yet finished. Only the structure is set.
params(rstudio) save RStudio environnment
feat(functions) improve the clean function to manipulate raw data

The cleaning.and.saving.data() function now manipulate raw data in order to modify the columns name and data type.
feat(script) add a new script to begin the exploratory data analysis
feat(script) add hist analysis (day, hour)
Merge branch 'master' of github.com:Twixer/88milSMS