Improved schema validation

* Added debug Dockerfile/Makefile
* Validation of examples in docs

tests/test_schemas.py

+from __future__ import print_function
+
+import json
+import unittest
+import os
+from os import path
+from fnmatch import fnmatch
+
+import pyld
+from jsonschema import validate, RefResolver, Draft4Validator, ValidationError
+
+root_path = path.join(path.dirname(path.realpath(__file__)), '..')
+schema_folder = path.join(root_path, 'senpy', 'schemas')
+examples_path = path.join(root_path, 'docs', 'examples')
+bad_examples_path = path.join(root_path, 'docs', 'bad-examples')
+
+class JSONSchemaTests(unittest.TestCase):
+    pass
+
+def do_create_(jsfile, success):
+    def do_expected(self):
+        with open(jsfile) as f:
+            js = json.load(f)
+        try:
+            assert '@type' in js
+            schema_name = js['@type']
+            with open(os.path.join(schema_folder, schema_name+".json")) as file_object:
+                schema = json.load(file_object)
+            resolver = RefResolver('file://' + schema_folder + '/', schema)
+            validator = Draft4Validator(schema, resolver=resolver)
+            validator.validate(js)
+        except (AssertionError, ValidationError, KeyError) as ex:
+            if success:
+                raise
+    return do_expected
+
+def add_examples(dirname, success):
+    for dirpath, dirnames, filenames in os.walk(dirname):
+        for i in filenames:
+            if fnmatch(i, '*.json'):
+                filename = path.join(dirpath, i)
+                test_method = do_create_(filename, success)
+                test_method.__name__ = 'test_file_%s_success_%s' % (filename, success)
+                test_method.__doc__ = '%s should %svalidate' % (filename, '' if success else 'not' )
+                setattr(JSONSchemaTests, test_method.__name__, test_method)
+                del test_method
+
+add_examples(examples_path, True)
+add_examples(bad_examples_path, False)
+
+if __name__ == '__main__':
+    unittest.main()