1377 - Blacklist dependencies from SCM tracking

Git excludes dependencies from commit. 
Mercurial just shows a warning because it doesn't support excludes on commits. Just hgignore
My `python(1)` installation tells me something different:

    mhennig@w540:~$ python -c 'print "test" in ["foo", "test"]'
    True

This works with `python3(1)` as well:

    mhennig@w540:~$ python3 -c 'print("test" in ["foo", "test"])'
    True

While I agree that the approach is not bad, I have to point out that I've just asked why the above example is not considered enough - I haven't asked you to change it (yet ;-))..