Remove Orange.egg-info dir from .gitignore

pip collects package metadata by invoking `python setup.py egg_info` and
reading information from the generated *.egg-info/ under the assumption
that there is only one such directory. This can cause problems for
developers who might have remaining Orange.egg-info directories in their
git checkouts, causing pip install -e . to pick up obsolete
dependencies, version, ...

This does not solve the problem, but at least `git status` will indicate
there are untracked files in the checkout and that `git clean` is in
order.

.gitignore

@@ -1,8 +1,6 @@
 # Build files
 build
 dist
-Orange.egg-info/*
-Orange.egg-info
 Orange3.egg-info
 Orange/version.py
 doc/build