issue #72 - cache expiration
Merge pull request #140 from timeck/issue-72

issue #72 - cache expiration
extra key/value type checks in compute() and bulkCompute() methods
Merge pull request #141 from timeck/someExtraChecks

extra key/value type checks in compute() and bulkCompute() methods
Issue #143 Fixing Ehcache.putIfAbsent to return previous value
Issue #143 Actually track the installement
Merge pull request #144 from alexsnaps/issue-143

Issue #143 Fixing Ehcache.putIfAbsent to return previous value