Adopted LRU from https://github.com/cluck, tested, fixed some issues (fix of issue#20)#22

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wwwenca:hotfix/issue#20

Commits on Sep 30, 2017

adopted LRU from https://github.com/cluck, tested, fixed some issues, especially multithreading access to LRU which caused fails
wwwenca
committed
fixed copilation error without ZERO_COPY, namings, added critical section even for release of the bundle
wwwenca
committed