Invenio-Client v0.1.0

*The-First-Snow-Release :tm:*
 
Signed-off-by: Jiri Kuncar <jiri.kuncar@cern.ch>
Instead of the "Tool..." phrase, this should read:

```
Invenio-Client permits to connect to remote Invenio digital library instances.
```

and similarly as we did for Workflow and Dictdiffer and Intbitset, a note should be added saying something like:

```
Invenio-Client has been originally developed within the Invenio software package.  This is first standalone public release.
```