Upgraded AndroidSdk to use path and platform utilities from sdklib

Searching for paths of tools and locating the installed Android platforms now done using sdklib. This should hopefully make the plugin more resilient to directory structure changes like we had in tools 22.
Removed console logging put in during testing
Merge branch 'sdklib' of https://github.com/nicstrong/maven-android-plugin into sdklib
made android sdk platform/api level mandatory including for ndk based projects, this is correcter and better than any other fixes I tried, also updated the tests to continue to work