Force error on import * from the .py file. Update tests.

We *want* users to be able to do:

```python
from plotly.graph_objs import *
```

NO ONE should do:

```python
from plotly.graph_objs.graph_objs import *
```

The former is a nicely-controlled namespace. The latter is not.

Author: theengineear

plotly/graph_objs/graph_objs.py

@@ -40,37 +40,7 @@
     from collections import OrderedDict
     import json
 
-__all__ = ["Data",
-           "Annotations",
-           "Area",
-           "Bar",
-           "Box",
-           "Contour",
-           "Heatmap",
-           "Histogram",
-           "Histogram2d",
-           "Histogram2dContour",
-           "Scatter",
-           "Annotation",
-           "AngularAxis",
-           "ColorBar",
-           "Contours",
-           "ErrorX",
-           "ErrorY",
-           "Figure",
-           "Font",
-           "Layout",
-           "Legend",
-           "Line",
-           "Margin",
-           "Marker",
-           "RadialAxis",
-           "Stream",
-           "Trace",
-           "XAxis",
-           "XBins",
-           "YAxis",
-           "YBins"]
+__all__ = None
 
 # TODO: BIG ONE, how should exceptions bubble up in this inheritance scheme?
     # TODO: related, WHAT exceptions should bubble up?

plotly/tests/test_core/test_graph_objs/test_annotations.py

@@ -8,7 +8,7 @@
 from __future__ import absolute_import
 
 from nose.tools import raises
-from plotly.graph_objs.graph_objs import *
+from plotly.graph_objs import *
 from plotly.exceptions import (PlotlyError,
                                PlotlyDictKeyError,
                                PlotlyDictValueError,

plotly/tests/test_core/test_graph_objs/test_data.py

@@ -8,7 +8,7 @@
 from __future__ import absolute_import
 
 from nose.tools import raises
-from plotly.graph_objs.graph_objs import *
+from plotly.graph_objs import *
 from plotly.exceptions import (PlotlyError,
                                PlotlyDictKeyError,
                                PlotlyDictValueError,

plotly/tests/test_core/test_graph_objs/test_error_bars.py

@@ -8,7 +8,7 @@
 from __future__ import absolute_import
 
 from nose.tools import raises
-from plotly.graph_objs.graph_objs import *
+from plotly.graph_objs import *
 from plotly.exceptions import (PlotlyDictKeyError,
                                PlotlyDictValueError,
                                PlotlyDataTypeError,
@@ -48,4 +48,4 @@ def test_instantiate_error_y():
 
 @raises(PlotlyDictKeyError)
 def test_key_error():
-    ErrorX(value=0.1, typ='percent', color='red')
+    ErrorX(value=0.1, typ='percent', color='red')