chore(*): add a Git .mailmap with my new name & some other people's entries

In this way:
* my past contributions are mapped correctly
* other people's distinct entries are collapsed into one

Author: mgol

.mailmap

@@ -0,0 +1,29 @@
+Andres Ornelas <aornelas@google.com>
+Caitlin Potter <caitpotter88@gmail.com>
+Caitlin Potter <caitpotter88@gmail.com> <snowball@defpixel.com>
+Di Peng <pengdi@google.com>
+Di Peng <pengdi@google.com> <pengdi@go.wustl.edu>
+Georgios Kalpakas <kalpakas.g@gmail.com>
+Georgios Kalpakas <kalpakas.g@gmail.com> <g.kalpakas@hotmail.com>
+Julie Ralph <ju.ralph@gmail.com>
+Lucas Galfaso <lgalfaso@gmail.com>
+Martin Staffa <mjstaffa@gmail.com>
+Martin Staffa <mjstaffa@gmail.com> <mjstaffa@googlemail.com>
+Matias Niemelä <matias@yearofmoo.com>
+Michał Gołębiowski-Owczarek <m.goleb@gmail.com>
+Misko Hevery <misko@hevery.com>
+Misko Hevery <misko@hevery.com> <misko@google.com>
+Igor Minar <igor@angularjs.org>
+Igor Minar <igor@angularjs.org> <iiminar@gmail.com>
+Igor Minar <igor@angularjs.org> <iminar@google.com>
+Igor Minar <igor@angularjs.org> <iminar@dhcp-172-19-37-154.mtv.corp.google.com>
+Pawel Kozlowski <pkozlowski.opensource@gmail.com>
+Peter Bacon Darwin <pete@bacondarwin.com>
+Rodric Haddad <rody@rodyhaddad.com>
+Shahar Talmi <shahar.talmi@gmail.com>
+Shahar Talmi <shahar.talmi@gmail.com> <shahart@wix.com>
+Shyam Seshadri <shyamseshadri@google.com>
+Shyam Seshadri <shyamseshadri@google.com> <shyamseshadri@gmail.com>
+Vojta Jina <vojta.jina@gmail.com>
+Vojta Jina <vojta@gemin-i.org>
+Vojta Jina <vojta@google.com>