added .mailmap

Now each committer has only one entry in shortlog
$ git shortlog -sn
  2094	John Hunter <[email protected]>
  1678	Michael Droettboom <[email protected]>
   916	Eric Firing <[email protected]>
   432	Darren Dale <[email protected]>
   355	Jae-Joon Lee <[email protected]>
   272	Andrew Straw <[email protected]>
   263	Steve Chaplin <[email protected]>
   194	Jouni K. Seppänen <[email protected]>
   149	Charles Moad <[email protected]>
   146	Ryan May <[email protected]>
   124	Ben Root <[email protected]>
    59	Jeff Whitaker <[email protected]>
    53	Manuel Metz <[email protected]>
    48	Norbert Nemec <[email protected]>
    45	James Evans <[email protected]>
    42	pkienzle <pkienzle@localhost>
    42	Todd Miller <[email protected]>
    29	Paul Barret <[email protected]>
    25	Michiel de Hoon <[email protected]>
    23	Jochen Voss <[email protected]>

Author: ivanov

.mailmap

@@ -0,0 +1,7 @@
+John Hunter <jdh2358@gmail.com> jdh2358 <jdh2358@gmail.com>
+Michael Droettboom <mdboom@gmail.com> Michael Droettboom <mdroe@stsci.edu>
+Jouni K. Seppänen <jks@iki.fi> Jouni K. Seppänen <jks@iki.fi>
+Ben Root <ben.v.root@gmail.com> Benjamin Root <ben.v.root@gmail.com>
+Michiel de Hoon <mjldehoon@yahoo.com> Michiel de Hoon <mdehoon@michiel-de-hoons-computer.local>
+Kevin Davies <kdavies4@gmail.com> Kevin Davies <daviesk24@yahoo.com>
+Christoph Gohlke <cgohlke@uci.edu> cgohlke <cgohlke@uci.edu>