Replaced subdirectory ant exec tasks with ant tasks
Replaced subdirectory ant exec tasks with ant tasks

Using the same ant runtime instead of invoking it
from the command line is better, because:
* It allows building without an ant binary, e.g. with the Ant
  plugin bundled with Eclipse.
* Build properties from the top-level project are inherited in
  sub-builds.
* It saves build time somewhat by not running multiple JRE instances.
seeschloss/phonegap-nfc,cjschooley/phonegap-nfc,don/phonegap-nfc,cjschooley/phonegap-nfc,don/phonegap-nfc,chariotsolutions/phonegap-nfc,GleasonTech/phonegap-nfc,BristolPound/phonegap-nfc,chariotsolutions/phonegap-nfc,thepi0/phonegap-nfc,thepi0/phonegap-nfc,GleasonTech/phonegap-nfc,don/phonegap-nfc,BristolPound/phonegap-nfc,BristolPound/phonegap-nfc,Telerik-Verified-Plugins/NFC,Telerik-Verified-Plugins/NFC,seeschloss/phonegap-nfc,jlkalberer/phonegap-nfc,jlkalberer/phonegap-nfc,chariotsolutions/phonegap-nfc,seeschloss/phonegap-nfc,Telerik-Verified-Plugins/NFC,GleasonTech/phonegap-nfc,thepi0/phonegap-nfc,cjschooley/phonegap-nfc,jlkalberer/phonegap-nfc