make executable
insecure downloads considered harmful
hook up Gradle build for notxw_social
add more build bits to example
modularize
Implement swipe to change tab, removing auto-hiding tabs
Move old java_social (a previous attempt at notxw_social) out of the way
Fix menu drawer button visibility

This regressed while factoring out the lists view into a separate
component.
add some utility Makefile targets for testing and releases