Fix duplicate import source graph_reference.

In Python 2, you *must* have an `__init__.py` file to have a python
package. However, in Python 3, you don’t need that!

We have `/graph_reference` and `graph_reference.py` defined, which seems
to *work*, but is poorly organized and should be fixed. For instance, it
causes `unresolved import errors` in IDEs that have `goto-source`-type
functionality.

Conflicts:
	makefile

Author: theengineear

Diff for: makefile

@@ -21,7 +21,7 @@ update_default_schema :
 	python -c "import requests;/
                from requests.compat import json as _json;\
                response = requests.get('https://api.plot.ly/v2/plot-schema?sha1';/
-               f = open('plotly/graph_reference/default-schema.json', 'w');\
+               f = open('plotly/package_data/default-schema.json', 'w');\
                _json.dump(response.json()['schema'], f, indent=4,\
                           sort_keys=True, separators=(',', ': '));\
                f.close()"

Diff for: plotly/graph_reference.py

@@ -66,7 +66,7 @@ def get_graph_reference():
     :return: (dict) The graph reference.
 
     """
-    path = os.path.join('graph_reference', 'default-schema.json')
+    path = os.path.join('package_data', 'default-schema.json')
     s = resource_string('plotly', path).decode('utf-8')
     graph_reference = _json.loads(s)
 

Diff for: plotly/graph_reference/default-schema.json renamed to plotly/package_data/default-schema.json

@@ -24,7 +24,7 @@ def test_get_graph_reference(self):
 
         # if we don't have a graph reference we load an outdated default
 
-        path = os.path.join('graph_reference', 'default-schema.json')
+        path = os.path.join('package_data', 'default-schema.json')
         s = resource_string('plotly', path).decode('utf-8')
         default_graph_reference = json.loads(s)
         graph_reference = gr.get_graph_reference()
@@ -41,7 +41,7 @@ def test_default_schema_is_up_to_date(self):
             content = response.content
         schema = json.loads(content)['schema']
 
-        path = os.path.join('graph_reference', 'default-schema.json')
+        path = os.path.join('package_data', 'default-schema.json')
         s = resource_string('plotly', path).decode('utf-8')
         default_schema = json.loads(s)
 

Diff for: plotly/tests/test_core/test_graph_reference/test_graph_reference.py

@@ -40,6 +40,8 @@ def readme():
                 'plotly/matplotlylib',
                 'plotly/matplotlylib/mplexporter',
                 'plotly/matplotlylib/mplexporter/renderers'],
-      package_data={'plotly': ['graph_reference/*.json', 'widgets/*.js', 'offline/*.js']},
+      package_data={
+          'plotly': ['package_data/*.json', 'widgets/*.js', 'offline/*.js']
+      },
       install_requires=['requests', 'six', 'pytz'],
       zip_safe=False)