Fix stored version in conda packages

Update conda recipe to build sdist and then install it so that
versioneer's version logic runs properly

Author: jonmmease

Diff for: packages/python/plotly/recipe/meta.yaml

@@ -10,7 +10,10 @@ source:
 
 build:
   number: 0
-  script: "cd packages/python/plotly; {{ PYTHON }} -m pip install . --no-deps --ignore-installed --no-cache-dir -q"
+  script: |
+    cd packages/python/plotly
+    {{ PYTHON }} setup.py sdist
+    {{ PYTHON }} -m pip install dist/plotly-{{ version }}.tar.gz --no-deps --ignore-installed --no-cache-dir -q
   noarch: python
 
 requirements: