Auto merge of #813 - o0Ignition0o:ssh_account_ignition, r=jdm

Add my SSH key

As discussed [here](servo/servo#19505 (comment)) and suggested by @jdm, I would like to have access to the mac build machines.

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/saltfs/813)
<!-- Reviewable:end -->

admin/files/ssh/jlempereur.pub

@@ -0,0 +1 @@
+ssh-rsa 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 ignition@ignition-laptop

admin/map.jinja

@@ -9,6 +9,7 @@
       'gw',
       'jack',
       'jdm',
+      'jlempereur',
       'jonleighton',
       'larsberg',
       'manishearth',