Remove umlauts so py3 installations on LANG=C systems succeed.

Closes  #2057.

IPython/core/release.py

@@ -114,7 +114,7 b" authors = {'Fernando' : ('Fernando Perez','[e-mail]'),"
            'Brian'    : ('Brian E Granger', '[e-mail]'),
            'Min'      : ('Min Ragan-Kelley', '[e-mail]'),
            'Thomas'   : ('Thomas A. Kluyver', '[e-mail]'),
-           'Jörgen'   : ('Jörgen Stenarson', '[e-mail]'),
+           'Jorgen'   : ('Jorgen Stenarson', '[e-mail]'),
            'Matthias' : ('Matthias Bussonnier', '[e-mail]'),
            }