Adding signing key in git config file.

.gitconfig

@@ -1,6 +1,7 @@
 [user]
-    name=Emmanuel Bouthenot
-    email=kolter@openics.org
+    name = Emmanuel Bouthenot
+    email = kolter@openics.org
+    signingkey = 929D42C3
 
 [alias]
     br = branch