Improve usability

[FavioVazquez]

We should make life easy from people coming from pandas, spark, R, etc. the usage of the framework.

I'm not saying lets copy the name, but I think some or them are too large o maybe confusing.

[FavioVazquez]

from @argenisleon

Right now to print a hist the user must:

priceDf = analyzer.get_data_frame.select("price") #or df.select("price")
hist_dictPri = analyzer.get_numerical_hist(df_one_col=priceDf, num_bars=10)
analyzer.plot_hist(df_one_col=priceDf, hist_dict= hist_dictPri, type_hist='categorical')

I think that we must simplify the function to:

analyzer.plot_hist(df, column, bins, type_hist='categorical')