Issue #173 fixed value of sent_to

Beside the main fix I changed `.travis.yml` and some minor things in a couple files like:
-updating `string.xml` to ignore lack of translation
-making copy of `proguard-android.txt` from `sdk` folder in `smssync`
-updating some tests
-changing `baseFragment` constructor to have no argument ( I haven't find any usages of this class but if someone want to use it he should take care of passing argument in a different way). 
I will remove class `BaseFragment`. This `21` is just random number to fill needed number of arguments in `public MessageSyncHttpClient( Context context, SyncUrl syncUrl, Message message, String toNumber, String deviceId)`. It's just for testing purpose. You want to put this `777777777` and `21` into string variables?