Revert "Upgrade distribute recipe."

This reverts commit 8754b1f70e68d44e7fc37dd41557e237becbb67a.
Merge branch 'master' of github.com:ContinuumIO/conda-recipes
Merge branch 'master' of github.com:ContinuumIO/conda-recipes
Merge branch 'master' of github.com:ContinuumIO/conda-recipes
Add uncertainties recipe.