Use kivy-garden's version of garden.

Tweak garden_requirements.

buildozer/__init__.py

@@ -402,7 +402,7 @@ class Buildozer(object):
             return
 
         self._ensure_virtualenv()
-        self.cmd('pip-2.7 install -e git+git@github.com:Ian-Foote/kivy_garden.git#egg=garden',
+        self.cmd('pip-2.7 install -e git+https://github.com/kivy-garden/garden.git#egg=garden',
                 env=self.env_venv,
                 )
 

buildozer/default.spec

@@ -35,7 +35,7 @@ version.filename = %(source.dir)s/main.py
 requirements = kivy
 
 # (list) Garden requirements
-#garden_requirements
+#garden_requirements =
 
 # (str) Presplash of the application
 #presplash.filename = %(source.dir)s/data/presplash.png