Use String(String,String) constructor in SmackConfiguration

String(String, Charset) is not available on all platforms, as it's only
provided by Android on API level 9 or higher.
Reworked Smack initialization

Move extension relevant configuration options from SmackConfiguration to
the extension. Introduced disabledSmackClasses that can be configured
via a system property or configuration file.
Send request after the PacketCollector was setup

This bug was introduced with 7bd7b3d24. Thanks to Lars Noschinski for
discovering it.
Properly escape PubSub item's text (SMACK-546)
Make JUL Loggers final (SMACK-536)
Add automatically scheduled pings in PingManager

replaces keep-alive functionality. SMACK-537
Remove non-SASL authentication code (SMACK-446)
Created 'tcp' subproject for TCPConnection

Renamed XMPPConnection to TCPConnection, since the other connection type
is also called BOSHConnection.
PingManager should notify PingFailedListeners only once

Fixes SMACK-548
Use correct namespace for MUC.getAdmins()

Fixes (again) SMACK-371
SMACK-53: create Version.Provider and .Manager

The Version.Provider is used to parse Version IQs. Integration:

	providerManager.addIQProvider("query", Version.NAMESPACE, new Version.Provider());

The Version.Manager is used to reply to Version IQs. Integration:

	Version.Manger.getInstanceFor(connection).setVersion(
		new Version("App Name", "1.23", "Operating System"));
SMACK-53: reviewer feedback updates

 * corrected extensions.provider
 * using weak connection reference in manager
 * license update
 * removed old namespace ELEMENT string
SMACK-53: remove flood protection
refactor Version.Manager and .Provider into own classes

This patch does:
 * refactor the Manager and Provider into separate classes in the
   hierarchy, comparable to iqprivate
 * update extensions.provider
 * rework how START_TAG parsing is done
 * re-use of the NAMESPACE element
 * removal of flood protection
 * weak-reference connection class
 * improve packet filter in the manager
 * add a test case