Avoid highlighting attributes as builtins.

[zvezdan]

The need for this was proposed by Carlos Pita.

I had to adapt the implementation to ensure that .1 and similar are
still highlighted or to show ">>> obj.method()" inside a
docstring/doctest in the original color instead of without color.

I've been using this version for months without noticing any issues.
It's ready for merge.

[zvezdan]

Can we get this merged?
It's been rebased from master and passes all the tests.

[brammool]

Zvezdan Petkovic wrote:

Can we get this merged?
It's been rebased from master and passes all the tests.

I prefer getting the new version of the file emailed.

Github doesn't make it easy to just get a raw diff...

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