bug #7049 Fix the platform.sh builds (wouterj)

This PR was merged into the 2.7 branch.

Discussion
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Fix the platform.sh builds

Commits
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5147da9 Temporary hardcode the version until platform.sh supports ~=
b5c35e4 Require Sphinx 1.3

Author: wouterj

.platform.app.yaml

@@ -46,7 +46,7 @@ disk: 512
 # Build time dependencies.
 dependencies:
   python:
-    sphinx: ">=1"
+    sphinx: "1.3.6"
 
 # The hooks that will be performed when the package is deployed.
 hooks: