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Until now, the transforms were applied at the same time the tree was
being built. This was problematic if the transform functions were
using inference, since the inference was executed on a partially
constructed tree, which led to failures when post-building
information was needed (such as setting the _from_names
for the From imports).
Now there's a separate step for transforms, which are applied
using transform.TransformVisitor.
There's a couple of other related changes:
* astroid.parse and AstroidBuilder gained a new parameter
`apply_transforms`, which is a boolean flag, which will
control if the transforms are applied. We do this because
there are uses when the vanilla tree is wanted, without
any implicit modification.
* the transforms are also applied for builtin modules,
as a side effect of the fact that transform visiting
was moved in AstroidBuilder._post_build from
AstroidBuilder._data_build.
Closes issue #116.
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