Add python 3.7 build

conda/camera/conda_build_config.yaml

@@ -7,6 +7,7 @@ cxx_compiler:
 python:
   - 2.7                        # [linux]
   - 3.6
+  - 3.7
 # This differs from target_platform in that it determines what subdir the compiler
 #    will target, not what subdir the compiler package will be itself.
 #    For example, we need a win-64 vs2008_win-32 package, so that we compile win-32