Add sklearn

* Add sklearn example
* Fix test_case
* Add SenpyClientUse docs

a.k.a. The wise men edition

docs/SenpyClientUse.rst

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+
+Client
+======
+
+Demo Endpoint
+-------------
+
+Import Client and send a request
+
+.. code:: python
+
+    from senpy.client import Client
+    
+    c = Client('http://latest.senpy.cluster.gsi.dit.upm.es/api')
+    r = c.analyse('I like Pizza', algorithm='sentiment140')
+
+Print response
+
+.. code:: python
+
+    for entry in r.entries:
+          print('{} -> {}'.format(entry['text'], entry['sentiments'][0]['marl:hasPolarity']))
+
+
+.. parsed-literal::
+
+    I like Pizza -> marl:Positive
+
+
+Obtain a list of available plugins
+
+.. code:: python
+
+    for plugin in c.request('/plugins')['plugins']:
+        print(plugin['name'])
+
+
+.. parsed-literal::
+
+    emoRand
+    rand
+    sentiment140
+
+
+Local Endpoint
+--------------
+
+Run a docker container with Senpy image and default plugins
+
+.. code::
+
+    docker run -ti --name 'SenpyEndpoint' -d -p 5000:5000 gsiupm/senpy:0.8.6 --host 0.0.0.0 --default-plugins
+
+
+.. parsed-literal::
+
+    a0157cd98057072388bfebeed78a830da7cf0a796f4f1a3fd9188f9f2e5fe562
+
+
+Import client and send a request to localhost
+
+.. code:: python
+
+    c_local = Client('http://127.0.0.1:5000/api')
+    r = c_local.analyse('Hello world', algorithm='sentiment140')
+
+Print response
+
+.. code:: python
+
+    for entry in r.entries:
+          print('{} -> {}'.format(entry['text'], entry['sentiments'][0]['marl:hasPolarity']))
+
+
+.. parsed-literal::
+
+    Hello world -> marl:Neutral
+
+
+Obtain a list of available plugins deployed locally
+
+.. code:: python
+
+    c_local.plugins().keys()
+
+
+.. parsed-literal::
+
+    rand
+    sentiment140
+    emoRand
+
+
+Stop the docker container
+
+.. code:: python
+
+    !docker stop SenpyEndpoint
+    !docker rm SenpyEndpoint
+
+
+.. parsed-literal::
+
+    SenpyEndpoint
+    SenpyEndpoint
+