Remove unnecesary files

.gitmodules

@@ -34,9 +34,3 @@
 [submodule "packages/lungo.icon"]
     path = packages/lungo.icon
     url = https://github.com/TapQuo/lungo.icon.git
-[submodule "packages/lungo.calendar"]
-    path = packages/lungo.calendar
-    url = https://github.com/TapQuo/lungo.calendar.git
-[submodule "packages/lungo.firefoxos"]
-    path = packages/lungo.firefoxos
-    url = https://github.com/TapQuo/lungo.firefoxos.git