Pass py_binary data deps through to underlying binary.

[optimality]

Also cleaning up the style a bit.

[bazel-io]

Can one of the admins verify this patch?

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[pshields]

I think this would fix an issue I ran into. It looks like without this change, the data deps to py_appengine_binary get silently dropped.

[pshields]

Can someone take a look at this merge it in? It looks like a pretty trivial fix.

A workaround in the meantime is to create a separate py_library and put the data argument on that. Then include that py_library as a dep to py_appengine_binary.

[bazel-io]

Can one of the admins verify this patch?

[pmbethe09]

passing the data deps LGTM, but the 'style fixes' are not appropriate, this is skylark not python.
https://docs.bazel.build/versions/master/skylark/bzl-style.html

Also, CLA not signed yet.

[pmbethe09]

This is not a cleanup. Skylark style has spaces around '=' which is different than python

[jo2y]

FWIW, I noticed the lack of 'data = data' while working on #71 and my PR includes the same fix.