Try fixing the submodule update by https-ing. Not using SSH key yet

Author: ErjanGavalji

.travis.yml

@@ -1,5 +1,11 @@
 language:
     android
+
+git:
+    submodules: false
+before_install:
+    - sed -i 's/git@github.com:/https:\/\/github.com\//' .gitmodules
+    - git submodule update --init --recursive
 android:
     components:
         - platform-tools