Beta version of the Python script in charge of running the R scripts

Beta version of a Python script which reads as a input a conf file
and execute the R scripts with the parameters obtained. A example
configuration file has been also added.
Use new variable json_dir to store JSON files
Add new variable to the example conf file
Add and handle a new variable for the Bicho backend
Define secondary log for R scripts

We'll keep on using a second log for R scripts. This is something
to be fixed in following improvements.
Fix error in IRC variable
Add call to get groups of devs by SCM activity