Feature/109

This PR adds a TDAF-compliant Conversion Pattern to log4j, including a transaction id. The README and some templates have been modified accordingly.

The issue #109 will be completed when all the traces are revised; this is necessary to create the alarm conditions table.
bootTimeMilliseconds has been already divided by 1000 at setup time, so I gess this should be just:

```
bootTimeMilliseconds = bootTimeMilliseconds + 1;
```
Regarding this can be also overflow, you are right. In that case +1 should be added to bootTime. However this could happen very rarerly (after 10,000,000,000,000 transactions :). Indeed, in Orion we don't control the overflow of milis.