[bdt new] added bob.extension to templates used for creating new bob.package

This merge request will close #38 (closed).

bob/devtools/templates/conda/meta.yaml

@@ -25,6 +25,7 @@ requirements:
   host:
     - python {{ python }}
     - setuptools {{ setuptools }}
+    - bob.extension
     # place your other host dependencies here
   run:
     - python