Use native progress bar drawable ids instead of custom ones.
Merge pull request #537 from antonyt/master

HoloEverywhere ProgressBar does not use native Android progress bar drawable ids
Add "UnixAdmin" to featured list [ci skip]
Hm... gradle build now broken. Thanks to new aar package format.
[ci skip]
Merge branch 'origin/master'

Conflicts:
	.gitignore
	.gitmodules
	build.gradle
	library/build.gradle