update gitmodules urls to use relative path so that protocol used at …

…top level is also used for submodule updates

.gitmodules

@@ -1,15 +1,15 @@
 [submodule "aces-core"]
 	path = aces-core
-	url = git@github.com:ampas/aces-dev.git
+	url = ../aces-core.git
 [submodule "aces-look"]
 	path = aces-look
-	url = git@github.com:ampas/aces-look.git
+	url = ../aces-look.git
 [submodule "aces-amf"]
 	path = aces-amf
-	url = git@github.com:ampas/aces-amf.git
+	url = ../aces-amf.git
 [submodule "aces-output"]
 	path = aces-output
-	url = git@github.com:ampas/aces-output.git
+	url = ../aces-output.git
 [submodule "aces-input-and-colorspaces"]
 	path = aces-input-and-colorspaces
-	url = git@github.com:ampas/aces-input-and-colorspaces.git
+	url = ../aces-input-and-colorspaces.git