res: drawable: Regenerate launcher icons for xhdpi/hdpi

Regen launcher icons based on original 512x512 design to improve
quality (instead of resizing previously resized xxhdpi PNG).

Optimize again using:
    https://github.com/SyNtheticNightmar3/optimize_png
libs: Remove unused lib

Cleans up the following warning:
  [dependency] WARNING: Found both android-support-v4 and android-support-v13 in the dependency list.
  [dependency] Because v13 includes v4, using only v13.
layout: player: Correct seekbar location

Looking at the API, LinearLayout doesn't seem to support
android:layout_gravity, which would explain why the UI for the
current player fragment is askew.
Line things up & move 'time' textviews.

After:
  http://bit.ly/1vR8RB0
Merge remote-tracking branch 'local/icon' into next
Merge pull request #8 from SyNtheticNightmar3/next

res: drawable: Regenerate launcher icons for xhdpi/hdpi …	18624bf
libs: Remove unused lib …	67ff50c
layout: player: Correct seekbar location …	5b295f9
Merge remote-tracking branch 'local/icon' into next