replace Integer.parseInt with BigInteger so that you can use longer Android version codes

I used to have DNS like version codes (YYYYmmmddXX format) for my apps builds, and I can't go back in older apps because Google Play wont allow me to upload inferior version codes, so I thing we should to use BigInteger instead of Integer.parseInt

This closes #298

framework/cordova.gradle

@@ -125,7 +125,7 @@ def doExtractIntFromManifest(name) {
     def pattern = Pattern.compile(name + "=\"(\\d+)\"")
     def matcher = pattern.matcher(manifestFile.getText())
     matcher.find()
-    return Integer.parseInt(matcher.group(1))
+    return new BigInteger(matcher.group(1))
 }
 
 def doExtractStringFromManifest(name) {