add orphaned odyssey.js git submodule and ignore = dirty

also to omit

* http://stackoverflow.com/questions/4873980/git-diff-says-subproject-is-dirty
* http://stackoverflow.com/questions/13159979/how-to-make-git-ignore-changes-to-submodules-by-default

.gitmodules

@@ -1,9 +1,16 @@
 [submodule "lib/Leaflet"]
 	path = lib/Leaflet
 	url = [email protected]:Leaflet/Leaflet.git
+	ignore = dirty
 [submodule "lib/ionicons"]
 	path = lib/ionicons
 	url = https://github.com/driftyco/ionicons.git
+	ignore = dirty
 [submodule "lib/Leaflet.awesome-markers"]
 	path = lib/Leaflet.awesome-markers
 	url = https://github.com/lvoogdt/Leaflet.awesome-markers.git
+	ignore = dirty
+[submodule "lib/odyssey.js"]
+	path = lib/odyssey.js
+	url = https://github.com/CartoDB/odyssey.js.git
+	ignore = dirty