[Logging] Implemented reopen method for file logger service.

This commit introduces special service, which uses file logger under the hood. It extends logger interface and provides `reopen` method for reopening logger's underlying file descriptor.

This is workaround for COCAINE-282.

An example config for `services` section:
```
"filelogger": {
    "type": "filelogger",
    "args": {
        "name": "some_name"
    }
}
```
Version bump.
Prettifying and wording.
Merge pull request #132 from 3Hren/v0.11

 Implemented reopen method for file logger service.