The karma tests don't pass yet, and aren't ready to land on develop.
This reverts commit 438453e61af74d38c7de57ac2d63317ed1f4a1ed, reversing
changes made to 50f94eb0402da92f8d6051ea53e4ee2d63a9663a.
After some discussion, we've agreed it's less evil to have package.json point
to git develop, even if you then have to do a manual build step. That avoids
any future problems where (for example) js-sdk develop gains experimental
changes which would break for users using a build process which involves a
manual git checkout.
