Another update

1. 41824bd model: An experimental support for LFU replacement policy (need further adjustments) by Alexander Afanasyev · 11 years ago
2. db64ff1 app+utils+doc: Adding application-level trace helper to record Interest-Data delays by Alexander Afanasyev · 11 years ago
3. 6978611 model: Some compilers got confused with "typedef policy policy". Renaming the typedefed name to policy_base by Alexander Afanasyev · 12 years ago
4. c3cc0b3 model: New content store variations: support for content freshness by Alexander Afanasyev · 12 years ago
5. 62304f2 model: fixing regression with trie data structure by Alexander Afanasyev · 12 years ago
6. 8566f45 model: Adding "new" content store with ability to track lifetime of entries by Alexander Afanasyev · 12 years ago
7. 991a0cc model: Generalizing content store implementation by Alexander Afanasyev · 12 years ago
8. adcccf4 model: Implementing two more events for forwarding strategy: DidAddFibEntry and WillRemoveFibEntry by Alexander Afanasyev · 12 years ago
9. 1a2df6a Small reorganization of utils/ folder contents by Alexander Afanasyev · 12 years ago