Add '--always' to 'git describe'
Add gitCommit to version resource
Add smack-android and redesign SASL authentication

This commit marks an important milestone with the addition of the
smack-android subproject. Smack is now able to run native on Android
without requiring any modifications, which makes the aSmack build
environment obsolete.

It was necessary to redesign the code for SASL authentication to achieve
this. Smack now comes with smack-sasl-provided for SASL implementations
that do not rely on additional APIs like javax for platforms where those
APIs are not available like Android.
Configure default Hostname Verifiers
Don't use IQReplyFilter for resource binding

as the local username is only available after binding (and legacy
session establishment). This makes Smack compatible again with XMPP
services that use the user's JID as from attribute in the result IQ
after the bind set IQ, e.g. Facebook:

SENT:
<iq id='sqvTK-1' type='set'>
  <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'>
    <resource>Smack</resource>
  </bind>
</iq>

RCV:
<iq from='user.name.1@chat.facebook.com' id='sqvTK-1' type='result'>
  <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'>
    <jid>user.name.1@chat.facebook.com/Smack</jid>
  </bind>
</iq>

Fixes SMACK-590
Prevent PacketCollector leaking

in AbstractXMPPConnection.createPacketCollectorAndSend(IQ) in case there
is a NoResponseException.
Use createPacketCollectorAndSend in FileTransferNegoiator

also fixes a potential PacketCollector leak.