rebase of desktop proguard
Fix missing or duplicate assets

when running desktop/run assets are copied to desktop/target. This caused
assembly to report multiple assets. Without assets explicitly added, they
were missing from jar when built without previously running the code.
I've replaced task dependency with runtime:full-classpath, which triggers
both compilation and resources copying. Now, resources are always included
exactly once.
fixed handling of provided dependencies in assembly task
update for 0.9.9
Update for current Libgdx 1.0.0-SNAPSHOT
bump default Android API level to 19