Create generic basic statistic component.

[Pineirin]

Create a generic statistics component which, given a record type and an interval of time (one day, one week, one month, etc...) returns the number of records of that type that were "created" in that time interval and the difference in percentage between the previous interval.
The available intervals of time should be:

• One day
• One week
• One month
• One year
• Five years

Apart from the "record type" and "interval of time" parameters a third parameter should indicate the description label of the statistic. For example, for a record uploaded the label would be "published", while for a community it would be "created".

The mockup proposed for this component is the following one: