#225 ExpiryStrategy.equals(Object) not implemented

[Ernst de Haan]

The equals(Object) method is not implemented in class
ExpiryStrategy.

If 2 ExpiryStrategy instances have the same precision
and duration, then they should be considered equal.

Note that if equals(Object) is implementation, then the
hashCode() method should also be implemented.

[Ernst de Haan]

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Fixed, with test case. Will be in XINS 1.4.0-beta1.