	Added the expiration definition to the javadoc for add, set, and replace.
	Added the expiration definition to the javadoc for add, set, and replace.

HubSpot/java-memcached-client,tootedom/spymemcached,resrugam/java-memcached-client,couchbase/spymemcached,Agilefant/spymemcached,dustin/java-memcached-client,tootedom/spymemcached-1,resrugam/java-memcached-client,dustin/java-memcached-client,HubSpot/java-memcached-client,douxiaozhao/java-memcached-client,resrugam/java-memcached-client,Agilefant/spymemcached,tootedom/spymemcached,1and1/java-memcached-client,douxiaozhao/java-memcached-client,douxiaozhao/java-memcached-client,HubSpot/java-memcached-client,tootedom/spymemcached,dustin/java-memcached-client,tootedom/spymemcached-1,couchbase/spymemcached,Agilefant/spymemcached,tootedom/spymemcached-1,couchbase/spymemcached