PR to solve issues #152 & #111

This PR solves issues [#111](https://github.com/telefonicaid/fiware-connectors/issues/111) and [#152](https://github.com/telefonicaid/fiware-connectors/issues/152).

Please read carefully modifications in flume/conf/log4j.properties.template 
Having a look to stackoverflow, it seems both size ant time based rolling cannot be done with log4j. A custom file appender has to be created, or use this one: http://www.simonsite.org.uk/

Nevertheless, this [guy](http://stackoverflow.com/questions/17347014/how-to-configure-log4j-to-roll-by-time-size-and-on-start) says it is possible but I don't see how...