Adding possibility to send userproperties to UIAutomator

Example:
<uiautomator>
	<propertiesKeyPrefix>Prefix</propertiesKeyPrefix>
</uiautomator>

> mvn <goal> -DPrefixKey=Value
Documenting the <propertiesKeyPrefix> more thoroughly.
Merge pull request #211 from SimonTurfer/master

Adding possibility to send userProperties to UIAutomator
added aar as supported extension
updated maven and adapted aether, also had to exclude old version of asm causing headaches
changed package for aether classes to org.eclipse and fixed where changed, current it compiles but tests fail NoClassDefFound org/sonatype/aether/RepositorySystemSession, not sure where that comes from
updated to sdk 22.0.2 components
added aar lifecycle mappingn and artifacthandler for aar initially as copy of apklib
a bit more stuff for aar support done .. just copied apklib setup for now
adding aarmojo as copy of apklib mojo for starters
minor refactoring: removing redundant argument from generateBuildConfigForPackage
Set custom BuildConfig constants from the plugin configuration
Merge pull request #218 from jonasfa/configurable-buildconfig

Custom BuildConfig constants from the plugin configuration
NDK mojo: ignore libs/ folder with just JARs for APKLIB dependencies
Updated to Builder 0.5.1
Builder 0.5.4
javadoc update removing sonatype aether reference
upgrades to testing libraries
Merge branch 'master' of github.com:jayway/maven-android-plugin
using new snapshot of plugin harness that should fix the problem once released