Fix XML attribute ordering in sample layout
Fix project.properties files
Add Maven POMs
Fix POM
[maven-release-plugin] prepare release v0.2
[maven-release-plugin] prepare for next development iteration
Convert to new Gradle-based build system.

Partially works toward chrisbanes/ActionBar-PullToRefresh#13 in that
a .aar library archive is produced now.

Signed-off-by: Eddie Ringle <eddie@eringle.net>