Outputing descriptive stats for the current state of data collection

[Oliph]

• [x] Time period (From to)
• [x] Total news
• [x] Total claims (maldita vs google)
• [x] Total tweets
• [x] Aggregation of public metrics from tweets
• [x] Aggregation of metrics from mynews
• [x] Adding all metadata
• [x] All of them on time serie
• [x] Plotting metric before and after fact check (aggregate)

[Oliph]

Progress done with the commit 603b661