deadcode in eventloops.py

[Carreau]

    from IPython.external.qt_for_kernel import QtCore

    if _use_appnope() and kernel._darwin_app_nap:
        from appnope import nope_scope as context
    else:
        from contextlib import contextmanager
        @contextmanager
        def context():
            yield

context seem to be unused in rest of the file.

[matholiveira91]

#try to make it generic

[osule]

@matholiveira91 I don't see context used outside this module in the project.
Do you supposed that it is used in some other project?

I can help on this issue.
cc: @Carreau

[Carreau]

closed by #355 ans #357 Good job all.