SMACK-361 Minor EntityCapsManager fixes

Don't use the constructor in ConnectionCreationListener to prevent
duplicate instances for the same connection. Fixed EntityCaps
documentation.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_3_2@13799 b35dd754-fafc-0310-a699-88a17e54d16e
SMACK-462 Use getInstace() ConnectionCreationListener

Prevent duplicate instances of a manager by using it's getInstance()
method instead of the manager's constructor.

git-svn-id: http://svn.igniterealtime.org/svn/repos/smack/branches/smack_3_3_2@13800 b35dd754-fafc-0310-a699-88a17e54d16e

Conflicts:
	source/org/jivesoftware/smack/keepalive/KeepAliveManager.java