Add AndroidSmackInitializer.initialize(Context)
This commit also changes the usage of the android.jar found in the
androidBootClasspath gradle variable, because
AndroidSmackInitializer.initialize(Context) pulls in
from minidns-android21, which has a @TargetApi annotation which is
only available on Android SDK API level 16 or higher. Otherwhise we
would get
> Task :smack-android:compileJava FAILED
/home/flo/.gradle/caches/modules-2/files-2.1/org.minidns/minidns-android21/0.3.0/13f273d095e51d701283062a25e867f3ff26d258/minidns-android21-0.3.0.jar(/org/minidns/dnsserverlookup/android21/AndroidUsingLinkProperties.class): warning: Cannot find annotation method 'value()' in type 'TargetApi': class file for android.annotation.TargetApi not found
/home/flo/.gradle/caches/modules-2/files-2.1/org.minidns/minidns-android21/0.3.0/13f273d095e51d701283062a25e867f3ff26d258/minidns-android21-0.3.0.jar(/org/minidns/dnsserverlookup/android21/AndroidUsingLinkProperties.class): warning: Cannot find annotation method 'value()' in type 'TargetApi'
error: warnings found and -Werror specified
1 error