GitLab

Note that the schema currently supports both string and object analysis in the
"analysis" field of a result.

* Add git fetch to (try to) fix github push from gitlab

Also added **simple** tests for backward and forward conversion.
In future versions we should add thorough tests.

Should close gsi-upm/senpy#31

* Added neutral point (if present)

Closes !gsi-upm/senpy#37 (Ian's)

Using this server in production is discouraged, but to implement a
proper asynchronous server with tornado/gevent every blocking call would
have to be converted to a non-blocking call.

Failing to do so causes deadlocks like #35

For now, it is easier to just use the default server.

Closes #34
Closes #24

It requires pandoc, which cannot be installed with pip.

We can either link to the nbfile or convert the file
manually/automatically:

```
nbconvert SenpyClientUse.ipynb --to rst
```

I've added a neutral point definition (in the converters senpy file) as used in pull request #29

I've used euclidean metric instead of taxicab as I feel it makes more sense (taxicab has bizzare unintuitive effects for points far from the centroids).