report main process version number on start

@mrdavidlaing, it reports data like this:

```
2014-11-27 09:42:41,388 [9] INFO  LogSearchShipper.LogSearchShipperService - { MainProcessVersion = 1.0.5444.30073 }
```

Looks ok for you?
@mrdavidlaing, as far as I understand this version is passed to the assembly version, so it already should be included. But let me check.