Defer plugin validation to init

* Merge branch '44-add-basic-evaluation-with-gsitk'
* Refactor requirements (add extra-requirements)
* Skip evaluation tests in Py2
* Fix installation with PIP
* Implement the evaluation service inside the Senpy API
* Connect Plugins to GSITK's evaluation module
* Add an evaluation method inside the Senpy Context
* Add the evaluation models and schemas
* Add Evaluation to the Playground, with a table view
* Add evaluation tests

.makefiles/python.mk

@@ -77,7 +77,6 @@ push-latest: $(addprefix push-latest-,$(PYVERSIONS)) ## Push the "latest" tag to
 	docker tag '$(IMAGEWTAG)-python$(PYMAIN)' '$(IMAGEWTAG)'
 	docker tag '$(IMAGEWTAG)-python$(PYMAIN)' '$(IMAGENAME)'
 	docker push '$(IMAGENAME):latest'
-	docker push '$(IMAGEWTAG)'
 
 push-latest-%: build-%  ## Push the latest image for a specific python version
 	docker tag $(IMAGENAME):$(VERSION)-python$* $(IMAGENAME):python$*

MANIFEST.in

@@ -1,5 +1,6 @@
 include requirements.txt
 include test-requirements.txt
+include extra-requirements.txt
 include README.rst
 include senpy/VERSION
 graft senpy/plugins

senpy/plugins/__init__.py

@@ -49,11 +49,11 @@ class PluginMeta(models.BaseMeta):
         attrs['name'] = alias
         if 'description' not in attrs:
             doc = attrs.get('__doc__', None)
-            if not doc:
+            if doc:
-                raise Exception(('Please, add a description or '
+                attrs['description'] = doc
-                                 'documentation to class {}').format(name))
+            else:
-            attrs['description'] = doc
+                logger.warn(('Plugin {} does not have a description. '
-            attrs['name'] = alias
+                             'Please, add a short summary to help other developers').format(name))
         cls = super(PluginMeta, mcs).__new__(mcs, name, bases, attrs)
 
         if alias in mcs._classes: