Adding possibility to send userproperties to UIAutomator

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

> mvn <goal> -DPrefixKey=Value
Documenting the <propertiesKeyPrefix> more thoroughly.
upgraded builder library to 0.4.1 so that sdk 22.0.1 components are used
Use `artifact.getId()` to avoid namespace colllisions

The previously used `artifact.getArtifactId()` is not guaranteed
to be unique - two apklibs with the same artifact id (e.g. 'library')
will overwrite their configuration.
Merge pull request #216 from jberkel/master

aidl generation: Use `artifact.getId()` to avoid namespace colllisions
Merge pull request #211 from SimonTurfer/master

Adding possibility to send userProperties to UIAutomator
updated to sdk 22.0.2 components
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