Pull request related to eclipse-wtp ignoring excludes by configuration (see http://goo.gl/5a3wc)

Hello,

As Szczepan requested in thread http://goo.gl/5a3wc I am now providing a pull request instead of a patch.
Please check if it is reasonable to do this.
It fixes the problem I described, and it seems reasonable to me that a common DependenciesExtractor be used wherever the list of depended-on artifacts is required for a direct/declared dependency.

All tests triggered by target ide:check passed.

Cheers,
illusioni