Issue #25: Fix bug getting last day of month in script and add config file

The config file has the following variables:
- Host: Host running ElasticSearch. Must not contain "http://".
- Index: The name of the index in which data will be inserted.
- Filter: The filter to get only part of Portal Transparencia's data.
Scripts were getting always the last day of the current month instead of the last day of the parameter's month.

Signed-off-by: Cristian Weiland <cw14@inf.ufpr.br>