Added isFullJID() helper in StringUtils

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_3_0@13575 b35dd754-fafc-0310-a699-88a17e54d16e
SMACK-430 Re-activated code that throws an exception if createOutgoingFileTransfer() was called with a bare JID

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_3_0@13576 b35dd754-fafc-0310-a699-88a17e54d16e
SMACK-384 Don't use a semaphore while waiting for PacketReader to be started.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_3_0@13577 b35dd754-fafc-0310-a699-88a17e54d16e