Cane

[x] - PCP with spark dataframes

[x] - Improvements in the example file and readme

[x] - New Citation

Use IDF with spark dataframes now!

Minor Changes to readme
Compatibility for python 3.6 and above

Menor Changes and open to python 3.6

General Improvements and creation of idf and PCP dictionaries functions

Check Readme for full description

Introduction of scaller functions (min max and standard scaler) with multicore support and columns choosing
Possibility of using a specific function!