Another update

1. 41824bd model: An experimental support for LFU replacement policy (need further adjustments) by Alexander Afanasyev · 11 years ago
2. 8566f45 model: Adding "new" content store with ability to track lifetime of entries by Alexander Afanasyev · 12 years ago
3. 991a0cc model: Generalizing content store implementation by Alexander Afanasyev · 12 years ago
4. e095f0f docs: Restructuring docs and adding new section about customizing Content Store and PIT by Alexander Afanasyev · 12 years ago
5. 1cd79ae docs: Documentation update by Alexander Afanasyev · 12 years ago
6. 1a2df6a Small reorganization of utils/ folder contents by Alexander Afanasyev · 12 years ago
7. 29c19b9 Content Store extension. Now it supports the same enumeration interface available for PIT and FIB by Alexander Afanasyev · 12 years ago
8. 2b4c947 Another set of refactoring by Alexander Afanasyev · 12 years ago