Merge pull request #429 from koraktor/code-quality

Reduce code duplication in Dalli::Server
namespace support symbol
add symbol support for namespace to history
proc should also be converted to string after called
remove :wunderschoen}
Merge pull request #431 from jaxi/feature/namespace_support_symbol

symbol support for namespace
Pool usage example
Merge branch 'master' of github.com:mperham/dalli
Transparently fix error with expiration intervals >30 days interpreted as timestamps by Memcached
moved tests for TTL translation to the test_server file [#436]
Added TTL translation to the history log [#436]
Merge pull request #436 from leonid-shevtsov/master

Fix for expiration intervals longer than 30 days
Deduplicate Dalli::Server#append and #prepend
Unify Dalli::Server#decr and #incr

This also supersedes #longlong.