added build tools 23.0.1 and 23.0.2 to travis config
added build tools 23.0.1 and 23.0.2 to travis config

secondsun/maven-android-plugin,secondsun/maven-android-plugin,secondsun/maven-android-plugin,WonderCsabo/maven-android-plugin,WonderCsabo/maven-android-plugin,simpligility/android-maven-plugin