Vibration feedback when transaction successful

[joseluu]

When transacting one has to keep the card on the reader for some time, a vibration feedback after the time has elapsed is a welcome confirmation for the user.

FIle SendTransactionActivity.java around line 255
For instance:
255 if (response.first.getError() != null) {
vibrateWarn(this);
showToast(response.first.getError().getMessage(), this);
} else {
vibrateOK(this);
showToast(getString(R.string.send_success), this);
}
} catch (IOException e) {
vibrateWarn(this);
showToast(getString(R.string.lost_tag), this);
Log.e(TAG, "IOException while sending ether transaction", e);