Updated snapcraft file to compile on Ubuntu 17.04

snapcraft.yaml

@@ -36,3 +36,15 @@ parts:
       - libyubikey-dev
       - libykpers-1-dev
     after: [desktop-qt5]
+  desktop-qt5:
+    # Redefine stage packages to work with Ubuntu 17.04
+    stage-packages:
+      - libxkbcommon0
+      - ttf-ubuntu-font-family
+      - dmz-cursor-theme
+      - light-themes
+      - shared-mime-info
+      - libqt5gui5
+      - libgdk-pixbuf2.0-0
+      - libqt5svg5 # for loading icon themes which are svg
+      - locales-all