New: Use multiarch with almost all native sample projects

+ Every project except "mixed-java-native-with-apklib-dependency" works
Merge pull request #34 from Gekkio/multiple-so-dependencies

Use multiarch builds for native samples
simple aar sample
Creation of an Android Archive 'aar'
Merge pull request #37 from Shusshu/feature-aar-lib

Creation of an Android Archive 'aar'
Merge pull request #36 from Macarse/aar-sample

simple aar sample
updated to new dev version 3.7.1-SNAPSHOT
moved aar projects together and renamed to better convention, deactivated consumption example for now
fixed artifactId and descriptions
Merge branch 'master' of https://github.com/jayway/maven-android-plugin-samples