Rename DEFAULT_LEASE_TIMEOUT to DEFAULT_REQUESTED_LEASE_TIMEOUT

As of JDK 7 b37 the EventClient API makes use of a requestedlease, first as a parameter of one of the constructors, second by defining a method getRequestedLease().
Considering the most common use case is perhaps not the constructor that takes a lease, I suggest to rename the parameter 'lease' and the method 'getLease()'.
By the way the API defines the field DEFAULT_LEASE_TIMEOUT, not DEFAULT_REQUESTED_LEASE_TIMEOUT or the like.