Fix double-slash bug. Clone only latest from master branches.

snapcraft.yaml

@@ -91,9 +91,10 @@ parts:
             chmod +x install_meteor.sh
             sh install_meteor.sh
             rm install_meteor.sh
-            mkdir -p packages
-            git clone https://github.com/wekan/flow-router.git packages/kadira-flow-router
-            git clone https://github.com/meteor-useraccounts/core.git packages/meteor-useraccounts-core
+            cd ~/.meteor/packages
+            git clone --depth 1 -b master https://github.com/wekan/flow-router.git kadira-flow-router
+            git clone --depth 1 -b master https://github.com/meteor-useraccounts/core.git meteor-useraccounts-core
+            sed -i 's/api\.versionsFrom/\/\/api.versionsFrom/' ~/.meteor/packages/meteor-useraccounts-core/package.js
         build: |
             rm -rf package-lock.json .build
             meteor add standard-minifier-js --allow-superuser