Publish Vulpes Preview 15 sources for desktop, Android and Tundra

Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.

gaia/distros/spark/apps.list

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+apps/bluetooth
+apps/bookmark
+apps/calendar
+apps/callscreen
+apps/camera
+apps/clock
+apps/communications
+apps/costcontrol
+apps/default_theme
+apps/download
+apps/email
+apps/emergency-call
+apps/findmydevice
+apps/fl
+apps/ftu
+apps/gallery
+apps/homescreen
+apps/keyboard
+apps/marketplace.firefox.com
+apps/music
+apps/network-alerts
+apps/operatorvariant
+apps/pdfjs
+apps/ringtones
+apps/search
+apps/setringtone
+apps/settings
+apps/sms
+apps/sync
+apps/system
+apps/verticalhome
+apps/video
+apps/wallpaper
+apps/wappush
+distros/spark/apps/*
+distros/spark/outoftree_apps/*