Prepare for Maven release
Change package name for GlowPadBackport library
Change package name for GlowPadBackport sample
Fix sample layout issues
Update demo app URL in README.md

The app is not still live!
Update Gradle/Maven configuration
Disable JavaDoc creation for releasing on Maven

For some reason Gradle complains about every single class ("class not
found") when generating the JavaDoc. Since the JavaDoc is not that good,
and since as they say "ain't nobody got time fo' that", we just disabled
JavaDoc generation.

Hey, don't judge me! It works!